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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