Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	$0.001 Par Value Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interest in Subsidiary [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2012	$ 36	$ 230,964	$ (5,906)	$ (4,129)	$ 770	$ 220,393	$ 442,128
Balance (in shares) at Dec. 31, 2012	36,272,550		(403,158)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee equity award plans activity	$ 1	16,673		0	0	0	16,674
Employee equity award plans activity (in shares)	764,446
Non-cash development expenses from joint venture					(347)	0	(347)
Net loss attributable to noncontrolling interest					(876)	0	(876)
Treasury stock			$ (213)	0	0		(213)
Treasury stock (in shares)			(9,795)
Net income					0	31,135	31,135
Foreign currency translations, net of tax				664	0	0	664
Balance at Dec. 31, 2013	$ 37	247,637	$ (6,119)	(3,465)	(453)	251,528	489,165
Balance (in shares) at Dec. 31, 2013	37,036,996		(412,953)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee equity award plans activity	$ 1	26,585		0	0	0	26,586
Employee equity award plans activity (in shares)	1,092,876
Non-cash development expenses from joint venture				0	453	0	453
Net loss attributable to noncontrolling interest							0
Treasury stock			$ (201)	0	0		(201)
Treasury stock (in shares)			(7,236)
Net income				0	0	36,741	36,741
Foreign currency translations, net of tax				457	0	0	457
Balance at Dec. 31, 2014	$ 38	274,222	$ (6,320)	(3,008)	0	288,269	$ 553,201
Balance (in shares) at Dec. 31, 2014	38,129,872		(420,189)				37,709,683
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee equity award plans activity	$ 2	43,749		0	0	0	$ 43,751
Employee equity award plans activity (in shares)	1,699,536
Net loss attributable to noncontrolling interest							0
Treasury stock			$ (100)	0	0		(100)
Treasury stock (in shares)			(2,641)
Net income				0	0	62,870	62,870
Foreign currency translations, net of tax				295	0	0	295
Balance at Dec. 31, 2015	$ 40	$ 317,971	$ (6,420)	$ (2,713)	$ 0	$ 351,139	$ 660,017
Balance (in shares) at Dec. 31, 2015	39,829,408		(422,830)				39,406,578