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Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 22,658 | $ 17,881
Intangible assets | 29,145 | 33,743
Research and development credits | 10,773 | 9,752
Depreciation | 7,426 | 7,223
Valuation reserves and accrued liabilities | 7,131 | 7,196
Stock compensation | 4,200 | 3,485
Defined benefit obligation | 1,974 | 2,027
Inventory | 1,571 | 1,284
Other credits | 12,068 | 11,753
Unrealized foreign currency exchange loss | 1,431 |
Other | 64 | 113
Total deferred tax asset | 98,441 | 94,457
Valuation allowance | (17,197) | (17,316)
Deferred tax liabilities: |  |
Unrealized foreign currency exchange gains |  | (674)
Undistributed profits of subsidiary | (5,727) | (4,629)
Property and equipment | (2,758) | (3,366)
Other | (572) | (733)
Total deferred tax liability | (9,057) | (9,402)
Net deferred tax asset | $ 72,187 | $ 67,739

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