Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2014	$ 29,004	$ 207	$ 279,952	$ (251,155)
Beginning Balance, shares at Dec. 31, 2014		20,705
Net loss and comprehensive loss	(13,654)			(13,654)
Issuance of common stock in a private placement, net of issuance costs of $805	9,194	$ 58	9,136
Issuance of common stock in a private placement, net of issuance costs of $805,Shares		5,840
Stock based compensation expense	806		806
Ending Balance at Dec. 31, 2015	25,350	$ 265	289,894	(264,809)
Ending Balance, shares at Dec. 31, 2015		26,545
Net loss and comprehensive loss	(13,654)			(13,654)
Stock based compensation expense	804		804
Ending Balance at Dec. 31, 2016	$ 12,500	$ 265	$ 290,698	$ (278,463)
Ending Balance, shares at Dec. 31, 2016		26,545