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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common stock
Additional paid-in capital
Accumulated deficit
Total
Beginning balances at Dec. 31, 2012 $ 25 $ 442,560 $ (437,531) $ 5,054
Beginning balances, shares at Dec. 31, 2012 25,237      
Share-based compensation expense $ 0 1,589 0 1,589
Share-based compensation expense, shares 323      
Exercise of options $ 0 41 0 41
Exercise of options, shares 23      
Sales of common stock and warrants $ 7 4,255 0 4,262
Sales of common stock and warrants, shares 6,128      
Exchange of warrants $ 0 536 0 536
Exchange of warrants, shares 358      
Net loss $ 0 0 (13,178) (13,178)
Ending balances at Dec. 31, 2013 $ 32 448,981 (450,709) (1,696)
Ending balances, shares at Dec. 31, 2013 32,069      
Share-based compensation expense $ 0 705 0 705
Share-based compensation expense, shares 105      
Sales of common stock and warrants $ 9 16,105 0 16,114
Sales of common stock and warrants, shares 8,871      
Exchange of warrants $ 4 9,865 0 9,869
Exchange of warrants, shares 3,713      
Net loss $ 0 0 (18,120) (18,120)
Ending balances at Dec. 31, 2014 $ 45 475,656 (468,829) 6,872
Ending balances, shares at Dec. 31, 2014 44,758      
Share-based compensation expense $ 0 1,011 0 1,011
Share-based compensation expense, shares 86      
Sales of common stock and warrants $ 1 3,205 0 3,206
Sales of common stock and warrants, shares 1,069      
Exchange of warrants       0
Exercise of warrants and options $ 1 3,299 0 3,300
Exercise of warrants and options, shares 1,510      
Net loss $ 0 0 (14,542) (14,542)
Ending balances at Dec. 31, 2015 $ 47 $ 483,171 $ (483,371) $ (153)
Ending balances, shares at Dec. 31, 2015 47,423