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Income Tax - Significant Components of Company's Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets |  |
Tax basis in excess of book value of assets | $ 850 |
Non-capital loss carryforwards | 33,524 | $ 496
Research and development deductions and credits | 5,506 |
Stock options | 51 |
§59(e) Capitalized R&D expenses | 3,252 |
Accrued expenses |  | 363
Other | 246 |
Total deferred tax assets | 43,429 | 859
Valuation allowance | (42,914) | (46)
Net deferred assets | 515 | 813
Deferred tax liabilities |  |
Intangible assets | (513) | (937)
Other | (2) |
Total deferred tax liabilities | (515) | (937)
Net deferred tax assets | $ 0 |
Deferred Tax Liabilities, Net |  | $ (124)

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