Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock [Member]	Additional paid-in capital [Member]	Accumulated comprehensive income (deficit) [Member]
BALANCE at Dec. 31, 2012	$ 42,662	$ 36	$ 211,165	$ (168,539)
BALANCE, Shares at Dec. 31, 2012		35,873,000
Non cash compensation recognized on stock options and ESPP	168		168
Restricted stock grants, net of cancellations	3,365	$ 1	3,364
Restricted stock grants, net of cancellations, shares		1,179,000
Cancellation of shares for payment of withholding tax	(114)		(114)
Cancellation of shares for payment of withholding tax, shares		(96,000)
Employee stock purchase plan	36		36
Employee stock purchase plan, shares		38,000
Comprehensive loss	(27,946)			(27,946)
BALANCE at Dec. 31, 2013	18,171	$ 37	214,619	(196,485)
BALANCE, Shares at Dec. 31, 2013		36,994,000
Exercise of common stock options	$ 6		6
Exercise of common stock options, shares	4,000	4,000
Non cash compensation recognized on stock options and ESPP	$ 157		157
Restricted stock grants, net of cancellations	3,495	$ 1	3,494
Restricted stock grants, net of cancellations, shares		1,421,000
Cancellation of shares for payment of withholding tax	(391)		(391)
Cancellation of shares for payment of withholding tax, shares		(292,000)
Employee stock purchase plan	21		21
Employee stock purchase plan, shares		27,000
Issuance of common stock in a private placement	5,242	$ 7	5,235
Issuance of common stock in a private placement, shares		6,846,000
Comprehensive loss	(11,799)			(11,799)
BALANCE at Dec. 31, 2014	$ 14,902	$ 45	223,141	(208,284)
BALANCE, Shares at Dec. 31, 2014	45,000,891	45,000,000
Exercise of common stock options	$ 10		10
Exercise of common stock options, shares	8,000	8,000
Non cash compensation recognized on stock options and ESPP	$ 186		186
Restricted stock grants, net of cancellations	1,967	$ 1	1,966
Restricted stock grants, net of cancellations, shares		1,091,000
Cancellation of shares for payment of withholding tax	(458)		(458)
Cancellation of shares for payment of withholding tax, shares		(394,000)
Tax benefit deficiencies related to restricted stock expense	5		5
Employee stock purchase plan	17		17
Employee stock purchase plan, shares		24,000
Comprehensive loss	(2,603)			(2,603)
BALANCE at Dec. 31, 2015	$ 14,026	$ 46	$ 224,867	$ (210,887)
BALANCE, Shares at Dec. 31, 2015	45,729,272	45,729,000