Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2010	$ 104,643	$ 52	$ 205,063	$ (100,173)	$ (299)
Balance (in shares) at Dec. 31, 2010		51,753,842
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of stock options (in shares)	2,278,451	2,278,451
Common stock issued upon exercise of stock options	9,708	2	9,706
Issuance of common stock in connection with LookIO acquisition	1,984		1,984
Stock-based compensation	6,771		6,771
Common stock issued under Employee Stock Purchase Plan (in shares)		58,051
Common stock issued under Employee Stock Purchase Plan	572		572
Tax benefit from exercise of employee stock options	4,001		4,001
Net (loss) income	12,038			12,038
Other comprehensive loss	(35)				(35)
Balance at Dec. 31, 2011	137,698	54	226,113	(88,135)	(334)
Balance (in shares) at Dec. 31, 2011		54,090,344
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of stock options (in shares)	1,634,658	1,634,658
Common stock issued upon exercise of stock options	8,318	2	8,316
Issuance of common stock in connection with LookIO acquisition, (in shares)		139,939
Stock-based compensation	10,715		10,715
Common stock issued under Employee Stock Purchase Plan (in shares)		83,983
Common stock issued under Employee Stock Purchase Plan	1,088		1,088
Stock repurchased during period (in shares)	0
Tax benefit from exercise of employee stock options	4,104		4,104
Net (loss) income	6,355			6,355
Other comprehensive loss	(19)				(19)
Balance at Dec. 31, 2012	170,243	56	252,320	(81,780)	(353)
Balance (in shares) at Dec. 31, 2012		55,948,924
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of stock options (in shares)	771,810	771,810
Common stock issued upon exercise of stock options	4,870		4,870
Stock-based compensation	12,508		12,508
Common stock issued under Employee Stock Purchase Plan (in shares)		155,388
Common stock issued under Employee Stock Purchase Plan	1,443		1,443
Stock repurchased during period (in shares)		(2,391,362)
Stock repurchased during period	(26,715)	(2)	(26,713)
Tax benefit from exercise of employee stock options	193		193
Net (loss) income	(3,499)			(3,499)
Other comprehensive loss	10				10
Balance at Dec. 31, 2013	$ 159,053	$ 54	$ 244,621	$ (85,279)	$ (343)
Balance (in shares) at Dec. 31, 2013		54,484,760