Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Derivative financial instruments		$ 267
Net operating losses	$ 13,643	5,525
Research and development credits	23,012	21,494
Depreciation	5,457	3,886
Valuation reserves and accrued liabilities	9,667	5,553
Foreign tax credit	6,926	1,654
Stock compensation	4,508	3,129
Inventory	1,571	1,622
Patents	218	156
Defined benefit obligation	2,306	2,011
Other credits	639	639
Other	116	10
Deferred tax assets, gross	68,063	45,946
Valuation allowance	(19,304)	(13,418)
Deferred tax liabilities:
Intangible assets	(8,442)	(10,161)
Unrealized foreign currency exchange gains	(285)	(3,797)
Undistributed profits of subsidiary	(12,002)	(3,254)
Property and equipment	(470)	(696)
Other	(319)	(342)
Deferred tax liabilities, gross	(21,518)	(18,250)
Net deferred tax asset	$ 27,241	$ 14,278