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Income Taxes - Details of Significant Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 13,394 | $ 15,337
State income taxes | 1 | 1
Deferred revenue | 5,349 | 458
Research and development and other credits | 11,447 | 11,418
Reserves and accruals recognized in different periods | 3,088 | 5,397
Basis difference in investment | 583 | 969
Capitalized R&D expenses | 3,623 | 4,569
Depreciation and amortization | 413 | 585
Deferred rent | 183 | 306
Other | 0 | 2
Total deferred tax assets | 38,081 | 39,042
Valuation allowance | (37,680) | (38,683)
Net deferred tax assets | 401 | 359
Deferred Tax Liabilities, Foreign Credits | (43) | (33)
Deferred Tax Liabilities, Net | (43) | (33)
Deferred Taxes, Net | $ 358 | $ 326

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