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v3.8.0.1

Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 12,731 | $ 13,643
Research and development credits | 27,257 | 23,012
Depreciation | 5,571 | 5,457
Valuation reserves and accrued liabilities | 6,020 | 9,667
Foreign tax credit |  | 6,926
Stock compensation | 3,955 | 4,508
Inventory | 2,062 | 1,571
Patents | 163 | 218
Defined benefit obligation | 1,977 | 2,306
Other credits | 589 | 639
Unrealized foreign currency exchange loss | 2,556 |
Other | 36 | 116
Deferred tax assets, gross | 62,917 | 68,063
Valuation allowance | (27,578) | (19,304)
Deferred tax liabilities: |  |
Intangible assets | (2,925) | (8,442)
Unrealized foreign currency exchange gains |  | (285)
Undistributed profits of subsidiary | (6,450) | (12,002)
Property and equipment | (1,611) | (470)
Other | (548) | (319)
Deferred tax liabilities, gross | (11,534) | (21,518)
Net deferred tax asset | $ 23,805 | $ 27,241

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