Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional paid-in capital	Accumulated deficit
Balance at Dec. 31, 2014	$ 30,409	$ 41	$ 143,086	$ (112,718)
Balance (shares) at Dec. 31, 2014	40,856,815	40,856,815
Stock-based compensation expense	240		240
Exercise of stock options (shares)	31,250	31,250
Exercise of stock options	152		152
Net loss	(8,525)			(8,525)
Balance at Mar. 31, 2015	$ 22,276	$ 41	$ 143,478	$ (121,243)
Balance (shares) at Mar. 31, 2015	40,888,065	40,888,065