Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Operations [Abstract]
Revenue	$ 154,044	$ 94,874	$ 32,822
Cost of revenue	67,371	43,602	17,710
Selling, general and administrative expenses	40,593	23,917	10,250
Loss on sale of patent assets, net		536
Operating income	46,080	26,819	4,862
Interest income	197	275	15
Other income (expense), net	5	12	(72)
Interest expense	(925)	(3,051)	(4,384)
Income before provision for (benefit from) income taxes	45,357	24,055	421
Provision for (benefit from) income taxes	16,225	10,184	(1,513)
Net income	29,132	13,871	1,934
Less: allocation of net income to participating stockholders	9,435	12,479	1,934
Net income available to common stockholders - basic	19,697	1,392
Undistributed earnings re-allocated to common stockholders	613	279
Net income available to common stockholders - diluted	$ 20,310	$ 1,671
Net income per common share:
Basic	$ 0.61	$ 0.24
Diluted	$ 0.57	$ 0.23
Weighted-average shares used in per common share calculation:
Basic	32,032	5,747	2,148
Diluted	35,920	7,164	2,169