Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - Jun. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2014	$ 103,424	$ 6			$ (105,629)
Balance, shares at Dec. 31, 2014		61,000
Common stock received for settlement of taxes and forfeited restricted stock	(538)			$ (538)
Common stock received for settlement of taxes and forfeited restricted stock, shares				(76)
Common stock issued for options exercised	2,294		$ 2,224	$ 366	(296)
Common stock issued for options exercised, shares		449		53
Common stock issued under the employee stock purchase plan	806		502	$ 160	144
Common stock issued under the employee stock purchase plan, shares		63		22
Issuance of restricted stock awards				$ 12	(12)
Issuance of restricted stock , shares		72		1
Stock-based compensation	4,210		4,210
Other comprehensive loss	(20)					$ (20)
Net loss	(13,278)				(13,278)
Balance at Jun. 30, 2015	129,182	$ 6	248,267		$ (119,071)	$ (20)
Balance, shares at Jun. 30, 2015		61,584
Equity component of convertible note issuance, net of issuance costs	$ 32,284		$ 32,284