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Income Tax - Significant Components of Company's Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets |  |
Tax basis in excess of book value of assets | $ 886 | $ 850
Non-capital loss carryforwards | 37,332 | 33,524
Research and development deductions and credits | 5,707 | 5,506
Stock options | 171 | 51
§59(e) Capitalized R&D expenses | 3,334 | 3,252
Other | 170 | 246
Total deferred tax assets | 47,600 | 43,429
Valuation allowance | (47,123) | (42,914)
Net deferred assets | 477 | 515
Deferred tax liabilities |  |
Intangible assets | (474) | (513)
Other | (3) | (2)
Total deferred tax liabilities | (477) | $ (515)
Net deferred tax assets | $ 0 |

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