CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock [Member] Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Total
Beginning balance at Dec. 31, 2014	$ 1	$ 6	$ 194,562	$ (182,293)	$ 0	$ 12,276
Beginning balance (in shares) at Dec. 31, 2014	11,787	6,037,232
Stock-based compensation	$ 0	$ 0	1,753	0	0	1,753
Stock-based compensation (in shares)	0	100,000
Conversion of convertible preferred stock	$ 0	$ 2	(2)	0	0	0
Conversion of convertible preferred stock (in shares)	(5,282)	2,059,455
Conversion of senior secured convertible debentures	$ 0	$ 2	4,813	0	0	4,815
Conversion of senior secured convertible debentures (in shares)	0	2,086,706
Discount on senior secured convertible debentures	$ 0	$ 0	27,300	0	0	27,300
Reclassification of warrant liability to stockholders' equity	0	0	(5,399)	0	0	(5,399)
Deemed dividend contribution to additional paid-in capital	0	0	2,962	0	0	2,962
Deemed dividend distribution from additional paid-in capital	0	0	(2,962)	0	0	(2,962)
Warrants issued in connection with debt	0	0	321	0	0	321
Registration costs	0	0	(33)	0	0	(33)
Other comprehensive income	0	0	0	0	1	1
Net loss	0	0	0	(24,947)	0	(24,947)
Ending balance at Dec. 31, 2015	$ 1	$ 10	223,315	(207,240)	1	16,087
Ending balance (in shares) at Dec. 31, 2015	6,505	10,283,393
Stock-based compensation	$ 0	$ 0	113	0	0	113
Stock-based compensation (in shares)	0	0
Conversion of convertible preferred stock	$ 0	$ 0	0	0	0	0
Conversion of convertible preferred stock (in shares)	(505)	196,686
Conversion of senior secured convertible debentures	$ 0	$ 1	264	0	0	265
Conversion of senior secured convertible debentures (in shares)	0	354,411
Reclassification of warrant liability to stockholders' equity	$ 0	$ 0	1,541	0	0	1,541
Warrants issued in connection with debt	0	0	47	0	0	47
Other comprehensive income	0	0	0	0	1	1
Net loss	0	0	0	(3,335)	0	(3,335)
Ending balance at Dec. 31, 2016	$ 1	$ 11	$ 225,280	$ (210,575)	$ 2	$ 14,719
Ending balance (in shares) at Dec. 31, 2016	6,000	10,834,490