CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance, (in shares) at Dec. 31, 2012		31,195,041
Balance, at Dec. 31, 2012	$ 84,124	$ 312	$ 187,051	$ 1,911	$ (105,150)
Net income	16,093				16,093
Unrealized gain (loss) on investments	(19)			(19)
Foreign currency translation adjustment	106			106
Share-based compensation expense	1,060		1,060
Exercise of stock options and vesting of restricted stock	2,522	$ 7	2,515
Exercise of stock options and vesting of restricted stock, Shares		730,700
Balance, (in shares) at Dec. 31, 2013		31,925,741
Balance, at Dec. 31, 2013	103,886	$ 319	190,626	1,998	(89,057)
Net income	8,170				8,170
Unrealized gain (loss) on investments	(28)			(28)
Foreign currency translation adjustment	(7,743)			(7,743)
Share-based compensation expense	1,766		1,766
Shares issued in acquisition (in shares)		215,285
Shares issued in acquisition	4,000	$ 2	3,998
Exercise of stock options and vesting of restricted stock	1,681	$ 7	1,674
Exercise of stock options and vesting of restricted stock, Shares		633,348
Balance, (in shares) at Dec. 31, 2014		32,774,374
Balance, at Dec. 31, 2014	111,732	$ 328	198,064	(5,773)	(80,887)
Net income	9,345				9,345
Unrealized gain (loss) on investments	22			22
Foreign currency translation adjustment	(2,815)			(2,815)
Share-based compensation expense	3,598		3,598
Exercise of stock options and vesting of restricted stock	866	$ 1	865
Exercise of stock options and vesting of restricted stock, Shares		174,979
Balance, (in shares) at Dec. 31, 2015		32,949,353
Balance, at Dec. 31, 2015	$ 122,748	$ 329	$ 202,527	$ (8,566)	$ (71,542)