CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Balance at Dec. 31, 2016		$ 260,671	$ (269)	$ (90,912)	$ 169,490
Balance (in shares) at Dec. 31, 2016	26,059,181				26,059,181
Increase (Decrease) in Stockholders' Equity
Exercise of stock options and vesting of RSUs		185			$ 185
Exercise of stock options and vesting of RSUs, shares	37,937
Unrealized loss on marketable securities			(52)		(52)
Foreign currency translation adjustment			72		72
Stock-based compensation expense		3,153			3,153
Net loss				(12,559)	(12,559)
Balance at Mar. 31, 2017		$ 264,009	$ (249)	$ (103,471)	$ 160,289
Balance (in shares) at Mar. 31, 2017	26,097,118				26,097,118