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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Total
Balances, beginning of period at Dec. 31, 2015 $ 438,900 $ (411,800) $ (35) $ 27,065
Balances, beginning of period (in shares) at Dec. 31, 2015 82,883,562      
Units issued (net of offering costs of $1,425) $ 15,883     15,883
Units issued (net of offering costs of $1,425) (in shares) 12,362,500      
Shares issued (RSUs vested/options exercised) $ 15     15
Shares issued (RSUs vested/options exercised) (in shares) 2,540,546      
Stock-based compensation $ 645     645
Other comprehensive income/(loss)     50 50
Net loss   (3,133)   (3,133)
Balances, end of period at Dec. 31, 2016 $ 455,443 (414,933) 15 40,525
Balances, end of period (in shares) at Dec. 31, 2016 97,786,608      
Shares issued (RSUs vested, net of shares withheld) $ (264)     (264)
Shares issued (RSUs vested, net of shares withheld) (in shares) 1,625,399      
Stock-based compensation $ 680     680
Other comprehensive income/(loss)     (20) (20)
Net loss   (8,184)   (8,184)
Balances, end of period at Sep. 30, 2017 $ 455,859 $ (423,117) $ (5) $ 32,737
Balances, end of period (in shares) at Sep. 30, 2017 99,412,007