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Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 17,881 | $ 7,666
Intangible assets | 33,609 | 42,853
Research and development credits | 9,752 | 8,211
Depreciation | 7,223 | 6,321
Valuation reserves and accrued liabilities | 7,196 | 4,849
Foreign tax credit | 262 | 376
Stock compensation | 3,485 | 4,128
Inventory | 1,284 | 1,069
Patents | 134 | 150
Defined benefit obligation | 2,027 | 1,796
Other credits | 11,491 | 3,701
Other | 114 | 89
Total deferred tax asset | 94,458 | 81,209
Valuation allowance | (28,763) | (9,977)
Deferred tax liabilities: |  |
Unrealized foreign currency exchange gains | (674) | (554)
Undistributed profits of subsidiary | (4,629) | (4,352)
Property and equipment | (3,366) | (2,896)
Other | (733) | (583)
Total deferred tax liability | (9,402) | (8,385)
Net deferred tax asset | $ 56,293 | $ 62,847

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