Condensed Consolidated Statements of Operation (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue	$ 47,044	$ 38,394	$ 146,131	$ 111,634
Cost of revenue	21,980	16,459	60,508	44,652
Selling, general and administrative expenses	13,147	9,069	39,903	28,465
(Gain) on sale of patent assets, net	0	0	(177)	0
Operating income	11,917	12,866	45,897	38,517
Other income (expense), net	65	(79)	92	(645)
Income before provision for income taxes	11,982	12,787	45,989	37,872
Provision for income taxes	4,392	4,935	17,130	15,659
Net income	7,590	7,852	28,859	22,213
Net income available to common stockholders:
Basic	7,556	7,381	28,378	12,858
Diluted	$ 7,557	$ 7,421	$ 28,399	$ 13,518
Net income per common share:
Basic	$ 0.15	$ 0.17	$ 0.57	$ 0.48
Diluted	$ 0.14	$ 0.15	$ 0.55	$ 0.43
Weighted-average shares used in computing net income per common share:
Basic	50,457	44,473	49,410	27,015
Diluted	52,127	48,914	51,711	31,125