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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