Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (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 Comprehensive Income (Loss) [Abstract]
Revenues:	$ 92,870	$ 56,257	$ 309,449	$ 162,199
Cost of sales (includes amortization of acquired intangible assets of $2,014, $518, $5,605, and $2,248)	69,973	38,755	193,747	108,008
Gross profit	22,897	17,502	115,702	54,191
Expenses and other income:
Engineering and technology	2,410	1,806	7,431	5,254
Sales and marketing	7,741	4,888	36,053	16,757
General and administrative	5,283	6,513	21,705	16,643
Depreciation	560	475	1,627	1,689
Amortization of intangible assets	3,169		8,450
Other loss, net	5,196	456	7,681	274
Total expenses and other loss	24,359	14,138	82,947	40,617
Income (loss) from continuing operations before income taxes	(1,462)	3,364	32,755	13,574
Income tax expense	(936)	(1,289)	(14,049)	(4,927)
Income (loss) from continuing operations	(2,398)	2,075	18,706	8,647
Discontinued operations:
Loss from discontinued operations, net of taxes				(2,253)
Loss on sale of discontinued operations, net of taxes				(7,674)
Net income (loss)	(2,398)	2,075	18,706	(1,280)
Income (loss) per share - Basic
Income (loss) from continuing operations	$ (0.06)	$ 0.05	$ 0.47	$ 0.23
Loss from discontinued operations				$ (0.06)
Loss on sale of discontinued operations				$ (0.20)
Basic net income (loss) per share	$ (0.06)	$ 0.05	$ 0.47	$ (0.03)
Weighted average shares outstanding used in computing basic income (loss) per share	40,511	38,568	40,108	37,451
Income (loss) per share - Diluted
Income (loss) from continuing operations	$ (0.06)	$ 0.05	$ 0.45	$ 0.23
Loss from discontinued operations				$ (0.06)
Loss on sale of discontinued operations				$ (0.20)
Diluted net income (loss) per share	$ (0.06)	$ 0.05	$ 0.45	$ (0.03)
Weighted average shares outstanding used in computing diluted income (loss) per share	40,511	39,158	41,425	38,131
Other comprehensive income (loss):
Net income (loss)	(2,398)	2,075	18,706	(1,280)
Unrealized gain on investments, available-for-sale	9	17		28
Unrealized loss on derivative instrument	(20)		(298)
Reclassification adjustment for realized gain on investments, available-for-sale, net, included in net income			(26)
Other comprehensive income (loss)	(11)	17	(324)	28
Comprehensive income (loss)	$ (2,409)	$ 2,092	$ 18,382	$ (1,252)