Consolidated Statements of Changes in Stockholders' (Deficit) Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Series A Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Common Stock Warrants	Notes Receivable for Purchase of Common Stock	Accumulated Deficit	Other Comprehensive Income (Loss)
Balance at Dec. 31, 2010	$ (42,022)	$ 366		$ 7,317	$ 2,022	$ (93)	$ (51,635)	$ 1
Balance (in shares) at Dec. 31, 2010		1,928,479	4,647,731
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(2,955)						(2,955)
Foreign currency translation adjustment	(42)							(42)
Issuance of shares upon initial public/follow-on offering, net of issuance costs	65,982		1	65,981
Issuance of shares upon initial public/follow-on offering, net of issuance costs (in shares)			7,500,000
Issuance of shares from exercise of stock options	1,401			1,401
Issuance of shares from exercise of stock options (in shares)			1,000,702
Issuance of shares from exercise of stock warrants	192			192
Issuance of shares from exercise of stock warrants (in shares)			50,196
Cashless exercise of preferred warrant	19			19
Cashless exercise of preferred warrant (in shares)			931,896
Preferred stock dividends and accretion	(2,205)						(2,205)
Issuance of stock warrants	4,534				4,534
Conversion of preferred stock to common stock	63,651	(366)	2	64,015
Conversion of preferred stock to common stock (in shares)		(1,928,479)	19,022,067
Conversion of preferred stock warrants to common stock warrants	4,054				4,054
Stock-based compensation - equity awards	3,980			3,980
Balance at Dec. 31, 2011	96,589		3	142,905	10,610	(93)	(56,795)	(41)
Balance (in shares) at Dec. 31, 2011			33,152,592
Increase (Decrease) in Stockholders' Equity
Net (loss) income	3,038						3,038
Foreign currency translation adjustment	223							223
Securities issued in connection with acquisition	1,984			1,984
Securities issued in connection with acquisition (in shares)			165,775
Issuance of shares upon initial public/follow-on offering, net of issuance costs	37,729		1	37,728
Issuance of shares upon initial public/follow-on offering, net of issuance costs (in shares)			2,200,000
Issuance of shares from exercise of stock options	4,081			4,081
Issuance of shares from exercise of stock options (in shares)			1,859,557
Issuance of shares from exercise of stock warrants	93			93
Issuance of shares from exercise of stock warrants (in shares)			449,877
Issuance of shares in payment of board of director fees	21			21
Issuance of shares in payment of board of director fees (in shares)			1,021
Issuance of shares from executive stock grant	150			150
Issuance of shares from executive stock grant (in shares)			9,639
Repurchase of common stock	(4,396)			(4,396)
Repurchase of common stock (in shares)			(357,751)
Repayment of notes receivable	93					93
Stock-based compensation - equity awards	9,015			9,015
Balance at Dec. 31, 2012	148,620		4	191,581	10,610		(53,757)	182
Balance (in shares) at Dec. 31, 2012			37,480,710
Increase (Decrease) in Stockholders' Equity
Net (loss) income	4,962						4,962
Foreign currency translation adjustment	(797)							(797)
Issuance of shares to employees and board of directors	761			761
Issuance of shares to employees and board of directors (in shares)			76,916
Issuance of shares from exercise of stock options	4,826			4,826
Issuance of shares from exercise of stock options (in shares)			1,015,817
Issuance of shares from exercise of stock warrants	35			35
Issuance of shares from exercise of stock warrants (in shares)			14,907
Issuance of shares from vesting of restricted stock units (in shares)			92,338
Repurchase of common stock	(6,893)			(6,893)
Repurchase of common stock (in shares)			(519,760)
Stock-based compensation - equity awards	12,498			12,498
Balance at Dec. 31, 2013	$ 164,012		$ 4	$ 202,808	$ 10,610		$ (48,795)	$ (615)
Balance (in shares) at Dec. 31, 2013			38,160,928