Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2012	$ 134,817	$ 15	$ 182,645	$ (47,843)
Beginning balance, shares at Dec. 31, 2012		14,812,759
Stock-based compensation	4,203		4,203
Exercise of stock options and issuance of restricted stock	3,735		3,735
Exercise of stock options and issuance of restricted stock, shares		497,248
Excess tax benefit of stock options exercised	156		156
Employee stock purchase plan	1,242		1,242
Employee stock purchase plan, shares		32,114
Stock offering, net of costs	47,569	$ 1	47,568
Stock offering, net of costs, shares		750,000
Net income	1,051			1,051
Ending balance at Dec. 31, 2013	192,773	$ 16	239,549	(46,792)
Ending balance, shares at Dec. 31, 2013		16,092,121
Stock-based compensation	5,396		5,396
Exercise of stock options and issuance of restricted stock	1,886		1,886
Exercise of stock options and issuance of restricted stock, shares		186,678
Excess tax benefit of stock options exercised	261		261
Employee stock purchase plan	1,338		1,338
Employee stock purchase plan, shares		26,353
Stock issued for acquisition	2,203		2,203
Stock issued for acquisition, Shares		43,595
Net income	2,704			2,704
Foreign currency translation adjustments	(1,470)				$ (1,470)
Ending balance at Dec. 31, 2014	205,091	$ 16	250,633	(44,088)	(1,470)
Ending balance, shares at Dec. 31, 2014		16,348,747
Stock-based compensation	6,379		6,379
Exercise of stock options and issuance of restricted stock	4,440	$ 1	4,439
Exercise of stock options and issuance of restricted stock, shares		346,885
Excess tax benefit of stock options exercised	2,336		2,336
Employee stock purchase plan	1,478		1,478
Employee stock purchase plan, shares		28,362
Net income	4,639			4,639
Foreign currency translation adjustments	(2,119)				(2,119)
Unrealized loss on investments	(59)				(59)
Ending balance at Dec. 31, 2015	$ 222,185	$ 17	$ 265,265	$ (39,449)	$ (3,648)
Ending balance, shares at Dec. 31, 2015		16,723,994