CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total
Balance as of beginning of the period at Dec. 31, 2016	$ 46	$ 435,551	$ (204,726)	$ (1)	$ 230,870
Balance as of beginning of the period (in shares) at Dec. 31, 2016	46,201,563
Stockholders' Equity
Exercise of stock options		1,195			1,195
Exercise of stock options (in shares)	131,468
Exercise of warrants (in shares)	138,903
Stock-based compensation		3,166	(69)		3,097
Follow-on Offering	$ 8	123,920			123,928
Follow-on Offering (in shares)	7,887,500
Other comprehensive loss, net of tax				(3)	(3)
Net loss			(15,654)		(15,654)
Balance as of end of the period at Mar. 31, 2017	$ 54	$ 563,832	$ (220,449)	$ (4)	$ 343,433
Balance as of end of the period (in shares) at Mar. 31, 2017	54,359,434