CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive income (loss)	Total
Balance at Dec. 31, 2014	$ 532	$ 484,197	$ (451,995)		$ 32,734
Balance (in shares) at Dec. 31, 2014	53,162,833
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued and shares issued for vested stock awards		453			453
KELTIP mark-to-market		40			40
KELTIP shares issued	$ 2	52			54
KELTIP shares issued (in shares)	172,500
Unrealized loss on marketable equity securities, net of tax				$ (127)	(127)
Net loss			(25,383)		(25,383)
Balance at Dec. 31, 2015	$ 534	484,742	(477,378)	(127)	7,771
Balance (in shares) at Dec. 31, 2015	53,335,333
Increase (Decrease) in Stockholders' Equity
Stock compensation accrued and shares issued for vested stock awards	$ 1	220			221
Stock compensation accrued and shares issued for vested stock awards (in shares)	217,968
Shares issued on conversion of Sentient Note	$ 274	6,943			7,217
Shares issued on conversion of Sentient Note (in shares)	27,366,740
Registered offering common stock, net and warrants	$ 80	3,519			3,599
Common stock issued (in shares)	8,000,000
Unrealized loss on marketable equity securities, net of tax				278	278
Net loss			(10,974)		(10,974)
Balance at Sep. 30, 2016	$ 889	$ 495,424	$ (488,352)	$ 151	$ 8,112
Balance (in shares) at Sep. 30, 2016	88,920,041