Payables and Accruals [Abstract] Trade accounts payable Accounts Payable, Trade, Current Research and development accruals Accrued Research And Development Research and development accruals Professional fee accruals Accrued Professional Fees, Current Payroll accruals Accrued Payroll Current Accrued Payroll Current Other accrued liabilities Other Accrued Liabilities, Current Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Commitments and Contingencies Disclosure [Abstract] Contingencies and Commitments [Table] Contingencies and Commitments [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Fair Value, Measurements, Recurring [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Blumberg and Drexel Blumberg and Drexel [Member] Blumberg and Drexel [Member] Blumberg Blumberg [Member] Blumberg Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Arbutus Inc. Arbutus Inc. [Member] Arbutus Inc. [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Arbitration with the University of British Columbia Arbitration With The University Of British Columbia [Member] Information related to arbitration with the University of British Columbia. Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Enantigen Enantigen [Member] Enantigen Contingencies and Commitments [Line Items] Contingencies and Commitments [Line Items] Loss contingency, damages sought for allegedly unpaid royalties Loss Contingency, Damages Sought, Value Number of legal proceedings Number of legal proceedings Number of legal proceedings Business combination, high end of payment upon achievement of certain triggering events Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Number of products covered by patent acquired under the agreement Number Of Products Covered By Patent Acquired Under Agreement Number Of Products Covered By Patent Acquired Under Agreement Development and regulatory milestones payment per licensed compound series, maximum License Agreement Maximum Development And Regulatory Milestone Payments Per License License Agreement, Maximum Development and Regulatory Milestone Payments Per License Development and regulatory milestones payment per royalty, maximum License Agreement Maximum Development And Regulatory Milestone Payments Per Royalty License Agreement Maximum Development And Regulatory Royalty Payment per Royalty Fair value of contingent consideration Business Combination, Contingent Consideration, Liability, Noncurrent Number of patent license agreements Number of Patent Licenses Number of Patent Licenses Research funding per year under research collaboration and funding agreement Contractual Obligation Amount Of Research Funding Per Year Contractual Obligation, Amount of Research Funding Per Year Research funding period Research Funding Period Research Funding Period Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Genevant Sciences Corporation Genevant Sciences Corporation [Member] Genevant Sciences Corporation [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Equity Method Investee Equity Method Investee [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Research and development services Research And Development Services [Member] Research And Development Services [Member] Administrative And Transitional Services Administrative And Transitional Services [Member] Administrative And Transitional Services [Member] Sublease, Burnaby Facility Sublease, Burnaby Facility [Member] Sublease, Burnaby Facility [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Expenses from transactions with related party Related Party Transaction, Expenses from Transactions with Related Party Income from related party Revenue from Related Parties Area of sublease facility Net Rentable Area, Sublease Net Rentable Area, Sublease Goodwill and Intangible Assets Disclosure [Abstract] Intangible assets and goodwill Goodwill and Intangible Assets Disclosure [Text Block] Leases [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Lease Arrangement, Type [Domain] Corporate Headquarters Located 701 Veterans Circle, Warminster, Pennsylvania Corporate Headquarters Located 701 Veterans Circle, Warminster, Pennsylvania [Member] Corporate Headquarters Located 701 Veterans Circle, Warminster, Pennsylvania Offices Located at 626 Jacksonville Rd., Warminster, Pennsylvania [Member] Offices Located at 626 Jacksonville Rd., Warminster, Pennsylvania [Member] Offices Located at 626 Jacksonville Rd., Warminster, Pennsylvania Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Number of leases Lessee, Operating Lease, Number of Leases Lessee, Operating Lease, Number of Leases Number of renewal options Lessee, Operating Lease, Number Of Renewal Options Lessee, Operating Lease, Number Of Renewal Options Lease renewal term Lessor, Operating Lease, Renewal Term Incremental borrowing rate Lessee, Operating Lease, Discount Rate Total operating lease expense Operating Lease, Expense Fixed lease payments Fixed Lease, Cost Fixed Lease, Cost Variable lease costs Variable Lease, Cost Straight-line fixed expenses leases Stright-line Fixed Lease, Cost Stright-line Fixed Lease, Cost Sublease income Sublease Income Statement of Cash Flows [Abstract] OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Net (loss)/income for the period Net Income (Loss) Attributable to Parent Items not involving cash: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation of property and equipment Depreciation, Depletion and Amortization Gain on sale of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Stock-based compensation expense Share-based Compensation Unrealized foreign exchange (gains) losses Foreign Currency Transaction Gain (Loss), Unrealized Change in fair value of contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Site consolidation non-cash portion Restructuring Costs Gain on equity investment Gain (Loss) on Investments Equity investment loss Gain (Loss) on Sale of Equity Investments Net change in non-cash operating items: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Accrued revenue Increase (Decrease) in Contract with Customer, Asset Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Deferred revenue Increase (Decrease) in Contract with Customer, Liability Site consolidation accrual Increase (Decrease) in Restructuring Reserve Other non-current liabilities Increase (Decrease) in Other Operating Liabilities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Acquisition of short-term investments Payments for (Proceeds from) Investments Disposition of short-term investments Proceeds from Sale of Restricted Investments Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Acquisition of property and equipment Payments to Acquire Property, Plant, and Equipment Net cash provided by (used) in investing activities Net Cash Provided by (Used in) Investing Activities FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Promissory note repayment Repayments of Notes Payable Proceeds from sale of Series A Preferred Shares, net of issuance costs Proceeds from Issuance of Convertible Preferred Stock Issuance of common shares pursuant to the Open Market Sale Agreement Proceeds from Issuance of Common Stock Issuance of common shares pursuant to exercise of options Proceeds from Stock Options Exercised Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Effect of foreign exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Increase (Decrease) in cash, cash equivalents, and restricted investment Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents, and restricted investment, beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents, and restricted investment, end of period Supplemental cash flow information Supplemental Cash Flow Information [Abstract] Non-cash transactions: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Preferred shares dividends accrued Dividends, Preferred Stock, Cash Accounting Policies [Abstract] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Shares Common Stock [Member] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Allocation of undistributed loss Undistributed Earnings (Loss) Available to Common Shareholders, Basic Net (loss) income attributable to common shares Net Income (Loss) Available to Common Stockholders, Basic Weighted average number of shares - basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average number of shares - diluted Weighted Average Number of Shares Outstanding, Diluted Basic and diluted net income (loss) attributable to shareholders per share Earnings Per Share, Basic and Diluted Statement of Stockholders' Equity [Abstract] Issuance costs on preferred stock issued Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Significant accounting policies Significant Accounting Policies [Text Block] Equity Method Investments and Joint Ventures [Abstract] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Roivant Sciences Ltd Roivant Sciences Ltd [Member] Roivant Sciences Ltd [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Property contribution to investment in Genevant Equity Method Investment, Property Contribution Equity Method Investment, Property Contribution Gains (losses) on equity method investments Income (Loss) from Equity Method Investments Ownership interest in equity method investment Equity Method Investment, Ownership Percentage Investment in Genevant Equity Method Investments Cash paid for amounts included in the measurement of lease liabilities Operating Lease, Payments Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term investments Short-term Investments Accounts receivable Accounts Receivable, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property and equipment, net of accumulated depreciation $8,105 (2018-$7,090) Property, Plant and Equipment, Net Right of use asset (note 8) Operating Lease, Right-of-Use Asset Intangible assets Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill Total assets Assets Liabilities and stockholders' equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable and accrued liabilities Site consolidation accrual Restructuring Reserve, Current Liability-classified options Employee Stock Options, Liability Classified, Outstanding Employee Stock Options, Liability Classified, Outstanding Lease liability, current Operating Lease, Liability, Current Total current liabilities Liabilities, Current Deferred rent and inducements, non-current Deferred Rent Credit, Noncurrent Contingent consideration Lease liability, non-current Operating Lease, Liability, Noncurrent Deferred tax liability Deferred Income Tax Liabilities, Net Total liabilities Liabilities Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred shares, Authorized - 1,164,000 with no par value, Issued and outstanding: 1,164,000 (December 31, 2018 - 1,164,000) Preferred Stock, Including Additional Paid in Capital, Net of Discount Common shares, Authorized - unlimited number with no par value, Issued and outstanding: 56,850,172 (December 31, 2018 - 55,518,800) Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Schedule of Lease Terms, Discount Rate and Supplemental Cash Flow Information Lease, Cost [Table Text Block] Schedule of Maturities of Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of basic and diluted net income (loss) per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Statement of Comprehensive Income [Abstract] Net loss Other comprehensive loss: Other Comprehensive Income (Loss), Net of Tax [Abstract] Share of other comprehensive loss of equity method investment (note 4) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Accumulated of property, plant, and equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Preferred stock, no par value (in USD per share) Preferred Stock, No Par Value Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Common shares, no par value (in USD per share) Common Stock, No Par Value Common shares, shares issued (in shares) Common Stock, Shares, Issued Common shares, shares outstanding (in shares) Common Stock, Shares, Outstanding Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets Assets, Fair Value Disclosure [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Short-term investments Investments, Fair Value Disclosure Total Assets Assets, Fair Value Disclosure Liabilities Liabilities, Fair Value Disclosure [Abstract] Liability-classified options Employee Stock Options, Liability Classified, Outstanding, Fair Value Disclosure Employee Stock Options, Liability Classified, Outstanding, Fair Value Disclosure Total Liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Liability classified stock options Employee Stock Option, Liability Classified [Member] Employee Stock Option, Liability Classified [Member] Fair Value, Liabilities Measured on Recurring Basis [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis [Roll Forward] Liability at beginning of the period Fair value of liability-classified options exercised in the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Fair Value Increase in fair value of liability Increase (Decrease) in Fair Value of Liability Classified Options Increase (Decrease) in Fair Value of Liability Classified Options Liability at end of the period Organization, Consolidation and Presentation of Financial Statements [Abstract] Nature of business and future operations Nature of Operations [Text Block] Related party transactions Related Party Transactions Disclosure [Text Block] Restructuring and Related Activities [Abstract] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Employee severance and relocation Employee Severance and Relocation [Member] Employee Severance and Relocation Facility and other expenses Facility Closing [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Total site consolidation expense Restructuring Charges Assets and liabilities measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Changes in fair value of liability option Changes In Fair Value of Liability Option [Table Text Block] Changes In Fair Value of Liability Option [Table Text Block] Schedule of changes in fair value of contingent consideration Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block] Equity method investment Equity Method Investments and Joint Ventures Disclosure [Text Block] Schedule of accounts payable and accrued liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Fair value of financial instruments Fair Value Disclosures [Text Block] Income Statement [Abstract] Revenue Revenues [Abstract] Revenue Revenues Expenses Operating Expenses [Abstract] Research, development, collaborations and contracts Research and Development Expense General and administrative General and Administrative Expense Depreciation Depreciation Total expenses Operating Expenses Loss from operations Operating Income (Loss) Other (loss) income Nonoperating Income (Expense) [Abstract] Interest income Investment Income, Interest Interest expense Interest Expense Foreign exchange gain (loss) Foreign Currency Transaction Gain (Loss), before Tax Gain on investment Equity investment loss Decrease (increase) in fair value of contingent consideration Increase (Decrease) In Fair Value Of Contingent Consideration Liability Increase (Decrease) In Fair Value Of Contingent Consideration Liability Total other (loss) income Nonoperating Income (Expense) Net (loss) income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Items applicable to preferred shares: Preferred Stock Dividends and Other Adjustments [Abstract] Accrual of coupon on convertible preferred shares Preferred Stock Dividends and Other Adjustments Net loss attributable to common shareholders, per share Earnings Per Share [Abstract] Basic (in USD per share) Earnings Per Share, Basic Diluted (in USD per share) Earnings Per Share, Diluted Weighted average number of common shares Weighted Average Number Of Common Shares [Abstract] Weighted average number of common shares Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Liability at beginning of the period Increase (decrease) in fair value of Contingent Consideration Liability at end of the period Contingencies and commitments Commitments and Contingencies Disclosure [Text Block] Stockholders' Equity Note [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Open Market Sale Agreement Open Market Sale Agreement [Member] Open Market Sale Agreement Jefferies LLC Jefferies LLC [Member] Jefferies LLC Preferred Shares Preferred Stock [Member] Convertible Preferred Stock Convertible Preferred Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Aggregate sale price of common shares under agreement Common Stock, Value, Subscriptions Number of shares issued under agreement (in sales) Sale of Stock, Number of Shares Issued in Transaction Proceeds from issuance of shares under the agreement Shares issued (in shares) Shares, Issued Issuance of common shares pursuant to the agreement Stock Issued During Period, Value, New Issues Preferred stated value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock dividend rate as a percent Preferred Stock, Dividend Rate, Percentage Number of common shares to be issued upon conversion of convertible preferred stock Convertible Preferred Stock, Shares Of Common Stock Issued upon Conversion Convertible Preferred Stock, Shares Of Common Stock Issued upon Conversion Ownership percentage by noncontrolling owners after conversion Noncontrolling Interest, Ownership Percentage By Noncontrolling Owners After Conversion Noncontrolling Interest, Ownership Percentage By Noncontrolling Owners After Conversion Investment commitment period Noncontrolling Interest, Investment Commitment Period Noncontrolling Interest, Investment Commitment Period Maximum ownership percentage by noncontrolling owners Noncontrolling Interest, Maximum Ownership Percentage by Noncontrolling Owners Noncontrolling Interest, Maximum Ownership Percentage by Noncontrolling Owners Proceeds from sale of stock Stockholders' equity and stock-based compensation Stockholders' Equity Note Disclosure [Text Block] Wholly-owed subsidiaries Wholly Owned Subsidiaries Included in Financial Statements Represents the number of wholly owned subsidiaries included in the reporting of the financial statements. Anti-dilutive common shares excluded from calculation of loss per common share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount ROU assets Lease liabilities Revenue from Contract with Customer [Abstract] Collaborations, contracts and licensing agreements Collaborative Arrangement Disclosure [Text Block] Facility closing Percentage of workforce reduction Restructuring and Related Cost, Expected Number of Positions Eliminated, Percent Restructuring and Related Cost, Expected Number of Positions Eliminated, Percent Expected total cost of site consolidation Restructuring and Related Cost, Expected Cost Site consolidation expense Basis of presentation Basis of Accounting, Policy [Policy Text Block] Principles of consolidation Consolidation, Policy [Policy Text Block] Income or loss per share Earnings Per Share, Policy [Policy Text Block] Equity method investment Equity Method Investments [Policy Text Block] Revenue recognition Revenue from Contract with Customer [Policy Text Block] Recent accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Fair value of financial instruments Fair Value Measurement, Policy [Policy Text Block] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] OMERS OMERS [Member] OMERS Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Onpattro™ (patisiran) Royalty [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Royalty interest sold percentage Royalty, Percentage of Interest Sold Royalty, Percentage of Interest Sold Minimum annual royalty revenue Revenue from Contract with Customer, Including Assessed Tax Gross proceeds from sale of royalty interest. before advisory fees Gross Proceeds From Royalty Interest Sold Gross Proceeds From Royalty Interest Sold Minimum royalties received Proceeds from Royalties Received Royalty guarantees commitments percentage Royalty Guarantees Commitments Percentage Represents the royalty guarantees commitments percentage. July through December 2019 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total Lease Payments Lessee, Operating Lease, Liability, Payments, Due Less: interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Present value of lease payments Operating Lease, Liability Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Convertible Preferred Shares Additional paid-in capital Additional Paid-in Capital [Member] Deficit Retained Earnings [Member] Accumulated other comprehen- sive loss AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Beginning balance (in shares) Beginning balance Accretion of coupon on Preferred Shares Preferred Stock, Accretion of Redemption Discount Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Certain fair value adjustments to liability stock option awards Adjustments to Additional Paid in Capital, Certain Fair Value Adjustments to Liability Stock Option Awards Adjustments to Additional Paid in Capital, Certain Fair Value Adjustments to Liability Stock Option Awards Issuance of common shares pursuant to the Sale Agreement (shares) Stock Issued During Period, Shares, New Issues Issuance of common shares pursuant to the Sale Agreement Issuance of common shares pursuant to exercise of options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Issuance of common shares pursuant to exercise of options Stock Issued During Period, Value, Stock Options Exercised Other comprehensive loss - currency translation adjustment Other Comprehensive Income (Loss), Net of Tax Ending balance (in shares) Ending balance Schedule of expenses and reserve recorded for site consolidation Restructuring and Related Costs [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity Current Reporting Status Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Small Business Entity Small Business Leases Lessee, Operating Leases [Text Block] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Site consolidation accrual as of December 31, 2018 Restructuring Reserve Additional accruals and other adjustments Payments Payments for Restructuring Site consolidation accrual as of June 30, 2019 Site consolidation Restructuring and Related Activities Disclosure [Text Block]