Condensed Consolidated Statements of Operations (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
Condensed Consolidated Statements of Operations [Abstract]
Revenue	$ 78,628	$ 75,058	$ 236,126	$ 183,881
Cost of revenue	44,785	44,341	135,807	109,775
Gross margin	33,843	30,717	100,319	74,106
Expenses:
Selling, general and administrative	17,171	13,096	47,860	36,166
Depreciation and amortization	1,170	993	3,166	3,029
Research and development	909	523	2,363	1,616
Total expenses	19,250	14,612	53,389	40,811
Income from operations	14,593	16,105	46,930	33,295
Other income (expense):
Loss on extinguishment of debt	0	0	(6,386)	(3,225)
Change in fair value of warrant liability	0	7,802	2,649	18,609
Interest expense	(1,830)	(3,287)	(6,245)	(12,633)
Other income (expense), net	(17)	23	(367)	43
Total other income (expense)	(1,847)	4,538	(10,349)	2,794
Income before income taxes	12,746	20,643	36,581	36,089
Income tax expense	(2,940)	(2,726)	(9,991)	(5,672)
Net income	9,806	17,917	26,590	30,417
Accrued dividends and accretion of discount on preferred stock	0	0	0	(4,868)
Net income attributable to common stockholders	$ 9,806	$ 17,917	$ 26,590	$ 25,549
Earnings per common share:
Basic earnings per common share	$ 0.20	$ 0.38	$ 0.55	$ 0.59
Diluted earnings per common share	$ 0.19	$ 0.35	$ 0.52	$ 0.55
Weighted average common shares:
Weighted average common shares used in computing basic earnings per common share	48,384	47,178	48,054	43,201
Weighted average common shares used in computing diluted earnings per common share	53,478	54,329	50,737	46,913