Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 83,109	$ 67,551	$ 162,844	$ 150,838
Cost of revenue	49,070	36,985	96,736	71,744
Selling, general and administrative expenses	25,904	18,997	52,799	38,456
Gain on sale of patent assets, net	0	(592)	0	(592)
Operating income	8,135	12,161	13,309	41,230
Interest income	102	181	186	320
Interest expense	(883)	0	(1,233)	0
Other income (expense), net	(768)	753	1,303	735
Total interest and other income (expense), net	(1,549)	934	256	1,055
Income before provision for income taxes	6,586	13,095	13,565	42,285
Provision for income taxes	2,436	5,065	5,178	16,224
Net income	$ 4,150	$ 8,030	$ 8,387	$ 26,061
Net income per share:
Basic (dollars per common share)	$ 0.08	$ 0.15	$ 0.16	$ 0.48
Diluted (dollars per common share)	$ 0.08	$ 0.14	$ 0.16	$ 0.47
Weighted-average shares used in computing net income per share:
Basic (in shares)	51,034	54,490	51,548	54,334
Diluted (in shares)	51,557	55,687	52,089	55,457