CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2016	44,000,614	44,000,614
Beginning balance at Dec. 31, 2016	$ 131,330	$ 44	$ 477,087	$ 58	$ (345,859)
Issuance of common stock from the exercise of stock options and settlement of restricted stock units	4,402	$ 1	4,401
Issuance of common stock form the exercise of stock options and settlement of restricted stock awards (in shares)		845,239
Stock-based compensation expense	4,912		4,912
Net loss	(9,179)				(9,179)
Other comprehensive loss, net of tax	$ (47)			(47)
Ending balance (in shares) at Jun. 30, 2017	44,845,853	44,845,853
Ending balance at Jun. 30, 2017	$ 131,418	$ 45	$ 486,400	$ 11	$ (355,038)