Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Operations [Abstract]
Revenues	$ 13,774	$ 10,771	$ 39,208	$ 31,459
Cost of revenues	3,560	2,329	9,521	6,776
Gross profit	10,214	8,442	29,687	24,683
Operating expenses:
Research and development	3,001	2,173	8,670	6,092
Sales and marketing	3,396	2,815	10,815	8,784
General and administrative	2,107	1,471	6,220	4,106
Management bonus plan associated with initial public offering	0	5,888	0	5,888
Amortization of intangible assets	209	75	628	226
Total operating expenses	8,713	12,422	26,333	25,096
Income (loss) from operations	1,501	(3,980)	3,354	(413)
Other (expense) income:
Interest income	23	9	67	22
Other (expense) income, net	(24)	20	(11)	1,696
Total other income, net	(1)	29	56	1,718
Income (loss) before income taxes	1,500	(3,951)	3,410	1,305
Income tax (expense) benefit	(741)	1,486	(1,651)	(566)
Net income (loss)	759	(2,465)	1,759	739
Dividends on redeemable preferred stock	0	715	0	2,079
Net income (loss) attributable to common stockholders	$ 759	$ (3,180)	$ 1,759	$ (1,340)
Net income (loss) attributable to common stockholders per share:
Basic	$ 0.03	$ (0.22)	$ 0.08	$ (0.09)
Diluted	$ 0.03	$ (0.22)	$ 0.08	$ (0.09)
Weighted average shares outstanding used in computing per share amounts:
Basic	22,012	14,558	21,549	14,241
Diluted	22,551	14,558	22,149	14,241