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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 gain (loss) on securities       $ (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 $ 2 250     252
Stock compensation accrued and shares issued for vested stock awards (in shares) 317,968        
Unrealized gain (loss) on securities       182 182
Shares issued on conversion of Sentient Note $ 273 6,944     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
Registered offering common stock, net and warrants (in shares) 8,000,000        
Net loss     (10,659)   (10,659)
Balance at Dec. 31, 2016 $ 889 $ 495,455 $ (488,037) $ 55 $ 8,362
Balance (in shares) at Dec. 31, 2016 89,020,041