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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, 2014 $ 438,083 $ (412,811) $ 11 $ 25,283
Balances, beginning of period (in shares) at Dec. 31, 2014 82,390,217      
Shares issued (RSUs vested/options exercised) (in shares) 493,345      
Shares issued (RSUs vested, net of shares withheld) (in shares)       493,345
Stock-based compensation $ 817     $ 817
Other comprehensive income/(loss)     (46) (46)
Net loss   1,011   1,011
Balances, end of period at Dec. 31, 2015 $ 438,900 (411,800) (35) 27,065
Balances, end 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      
Shares issued (RSUs vested, net of shares withheld) (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     1,625,399
Stock-based compensation $ 874     $ 874
Other comprehensive income/(loss)     (17) (17)
Net loss   (12,035)   (12,035)
Balances, end of period at Dec. 31, 2017 $ 456,053 $ (426,968) $ (2) $ 29,083
Balances, end of period (in shares) at Dec. 31, 2017 99,412,007