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Significant Accounting Policies - Additional Information (Details) |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2018 USD ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2018 USD ($) Segment shares | Jan. 01, 2019 USD ($) | Dec. 31, 2018 CAD ($) shares | Sep. 30, 2018 shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Revenue from license fee |  |  | $ 478,000 |  |  |  |  |
Type of Revenue [Extensible List] |  |  | us-gaap:LicenseMember |  |  |  |  |
Refund from research and developement tax credit |  | $ 100,000 | $ 100,000 |  |  |  |  |
Inventory markdowns to net realizable value |  |  | $ 0 |  |  |  |  |
Number of stock options outstanding | shares |  | 3,308,049 | 3,308,049 |  | 3,308,049 |  | 2,448,646 | 1,969,000
Modified employee stock options outstanding fair value | $ 10,300,000 |  |  |  |  |  |  |
Reclassification of stock based compensation liability classified stock options |  | $ 0 | $ 0 |  |  |  |  |
Current receivables |  | 200,000 | 200,000 |  |  |  |  |
Non-current receivables |  | 294,000 | 294,000 |  |  |  |  |
Contract assets |  | 0 | 0 |  |  |  |  |
Contract liabilities |  | 0 | $ 0 |  |  |  |  |
Number of operating segment | Segment |  |  | 1 |  |  |  |  |
Number of reportable segment | Segment |  |  | 1 |  |  |  |  |
Derivative financial instruments |  | 13,769,000 | $ 13,769,000 |  |  |  | $ 9,578,000 |
Accounting Standards Update 2016-02 | Subsequent Event |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Lease liability and right of use asset recognized |  |  |  | $ 700,000 |  |  |  |
Employee and Non-employee Stock Options |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of stock options outstanding | shares |  |  |  |  |  | 2,741,146 |  |
Non-employee Stock Options |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Derivative financial instruments |  | 0 | $ 0 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Effective income tax rate |  |  | 50.00% |  |  |  |  |
Leasehold Improvements |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  |  | 5 years |  |  |  |  |
Furniture and Fixtures |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  |  | 7 years |  |  |  |  |
Computer Software and Hardware | Minimum |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  |  | 3 years |  |  |  |  |
Computer Software and Hardware | Maximum |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  |  | 5 years |  |  |  |  |
Equipment |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  |  | 15 years |  |  |  |  |
Strategic Alliance Agreement | Heuro Canada Inc. | HealthTech Connex, Inc. |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Revenue from license fee |  | $ 500,000 |  |  |  |  |  |
Type of Revenue [Extensible List] |  | us-gaap:LicenseMember |  |  |  |  |  |
Consideration for license |  |  |  |  | $ 750,000 |  |  |
License consideration first annual installment |  |  |  |  | 250,000 |  |  |
License consideration second annual installment |  |  |  |  | 250,000 |  |  |
License consideration third annual installment |  |  |  |  | $ 250,000 |  |  |
License Fees | Strategic Alliance Agreement |  |  |  |  |  |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Revenue from license fee |  |  | $ 500,000 |  |  |  |  |

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