Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance (in shares) at Dec. 31, 2013		54,484,760	0
Beginning Balance at Dec. 31, 2013	$ 159,053	$ 54	$ 0	$ 244,621	$ (85,279)	$ (343)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with acquisition, (in shares)		1,627,753
Issuance of common stock in connection with acquisition	$ 20,123	$ 2		20,121
Common stock issued upon exercise of stock options (in shares)	1,098,000	1,097,543
Common stock issued upon exercise of stock options	$ 7,883	$ 1		7,882
Stock-based compensation	12,306			12,306
Common stock issued under Employee Stock Purchase Plan (in shares)		142,064
Common stock issued under Employee Stock Purchase Plan	1,431	$ 1		1,430
Common stock repurchase (in shares)		(650,789)	(544,396)
Common stock repurchase	(12,980)	$ (1)	$ (1)	(12,978)
Tax benefit from exercise of employee stock options	664			664
Net loss	(7,348)				(7,348)
Other comprehensive loss	(795)					(795)
Ending Balance (in shares) at Dec. 31, 2014		56,701,331	(544,396)
Ending Balance at Dec. 31, 2014	$ 180,337	$ 57	$ (1)	274,046	(92,627)	(1,138)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of stock options (in shares)	646,000	645,531
Common stock issued upon exercise of stock options	$ 2,904	$ 0		2,904
Stock-based compensation	11,814			11,814
Common stock issued under Employee Stock Purchase Plan (in shares)		170,857
Common stock issued under Employee Stock Purchase Plan	1,497	$ 0		1,497
Common stock repurchase (in shares)		(142,812)	(277,360)
Common stock repurchase	(4,202)	$ 0	$ 0	(4,202)
Tax benefit from exercise of employee stock options	797			797
Net loss	(26,444)				(26,444)
Other comprehensive loss	(1,398)					(1,398)
Ending Balance (in shares) at Dec. 31, 2015		57,374,907	(821,756)
Ending Balance at Dec. 31, 2015	$ 165,305	$ 57	$ (1)	286,856	(119,071)	(2,536)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued upon exercise of stock options (in shares)	325,000	324,502
Common stock issued upon exercise of stock options	$ 1,806	$ 0		1,806
Common stock issued upon vesting of restricted stock units (in shares)		393,504
Common stock issued upon vesting of restricted stock units	1	$ 1
Stock-based compensation	9,736			9,736
Common stock issued under Employee Stock Purchase Plan (in shares)		183,534
Common stock issued under Employee Stock Purchase Plan	1,092	$ 0		1,092
Common stock repurchase (in shares)			1,518,349
Common stock repurchase	(9,967)		$ (1)	(9,966)
Net loss	(25,873)				(25,873)
Other comprehensive loss	(3,624)					(3,624)
Ending Balance (in shares) at Dec. 31, 2016		58,276,447	(2,340,105)
Ending Balance at Dec. 31, 2016	$ 138,476	$ 58	$ (2)	$ 289,524	$ (144,944)	$ (6,160)