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Net Loss per Common Share - Calculation of Net Loss and Number of Shares Used to Compute Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net loss - basic     $ (8,353) $ (25,873)
Adjustment for gain on warrant income     (534)  
Net loss - diluted     $ (8,887) $ (25,873)
Weighted average shares outstanding - basic [1] 35,859,866 2,763 13,888,577 1,494
Weighted average shares outstanding - diluted [1] 35,859,866 2,763 13,888,587 1,494
Net loss per share - basic [1] $ (0.25) $ (4,565) $ (0.60) $ (17,313)
Net loss per share - diluted [1] $ (0.25) $ (4,565) $ (0.64) $ (17,313)
[1] reflects a one-for-three hundred and fifty (1:350) reverse stock split effected on November 6, 2017 and a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018.