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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, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]                
Net loss $ (4,991) $ (4,275) $ (7,861) $ (7,519) $ (5,959) $ (7,894) $ (17,127) $ (21,371)
Deemed dividend for triggering of warrant down round feature             (55)  
Net loss attributable to common stockholders $ (4,991)     $ (7,519)     $ (17,182) $ (21,371)
Weighted average shares outstanding - basic [1] 4,288,593     101,862     2,217,611 102,956
Weighted average shares outstanding - diluted [1] 4,288,593     101,862     2,217,611 102,956
Net loss per share - basic [1] $ (1.16)     $ (73.82)     $ (7.75) $ (207.58)
Net loss per share - diluted [1] $ (1.16)     $ (73.82)     $ (7.75) $ (207.58)
[1] * reflects, one-for-seven hundred (1:700) reverse stock split effected on December 24, 2019.