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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 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]                    
Net (loss) income - basic $ (7,519) $ (5,959) $ (7,894) $ (8,880) $ (6,658) $ 7,185 $ (21,371) $ (8,353) $ (19,222) $ (45,117)
Preferred stock dividends (18,238)           (18,238)     (527)
Adjustment for gain on warrant income       (13)       (534)    
Net loss - diluted $ (25,757)     $ (8,893)     $ (39,609) $ (8,887) $ (19,222) $ (45,644)
Weighted average shares outstanding - basic 26,112 [1]     51,229 [1]     23,095 [1] 19,841 [1] 38,151 21
Weighted average shares outstanding - diluted 26,112 [1]     51,229 [1]     23,095 [1] 19,841 [1] 38,151 21
Net loss per share - basic $ (287.00) [1]     $ (175.00) [1]     $ (924.00) [1] $ (420.00) [1] $ (504.00) $ (2,275,000)
Net loss per share - diluted $ (987.00) [1]     $ (175.00) [1]     $ (1,715.00) [1] $ (448.00) [1] $ (504.00) $ (2,275,000)
[1] reflects a one-for-five hundred (1:500) reverse stock split effected on May 2, 2018 and a one-for-seven hundred (1:700) reverse stock split effected on December 24, 2019.