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Stockholders' Equity - Stock Options and Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Warrants, Number of Shares [Roll Forward]      
Warrants, Outstanding, Beginning of Period (in shares) 30,000 30,000  
Warrants, Granted (in shares)   2,608,355  
Warrants, Exercised (in shares)   0  
Warrants, Forfeited (in shares)   0  
Warrants, Expired (in shares)   0  
Warrants, Outstanding, End of Period (in shares)   2,638,355  
Warrants Weighted Average Exercise Price [Roll Forward]      
Warrants Outstanding, Beginning of Period (in dollars per share) $ 5.89 $ 5.89  
Warrants, Granted (in dollars per share)   2.14  
Warrants, Exercised (in dollars per share)   0  
Warrants, Forfeited (in dollars per share)   0  
Warrants, Expired (in dollars per share)   0  
Warrants Outstanding, End of Period (in dollars per share)   $ 2.18  
Warrants, Outstanding, Weighted Average Remaining Contractual Term 3 years 2 months 8 days 4 years 11 months 23 days  
Warrants Outstanding, Aggregate Intrinsic Value   $ 0 $ 0
Warrants, Vested and expected to vest (in shares)   2,638,355  
Weighted Average Exercise Price, Warrants Vested And Expected To Vest   $ 2.18  
Warrants, Vested and expected to vest, Weighted Average Remaining Contractual Term   4 years 11 months 23 days  
Warrants, Vested and expected to vest, Aggregate Intrinsic Value   $ 0  
Warrants, Vested (in shares)   2,638,355  
Warrants, Vested, Weighted Average Exercise Price (in dollars per share)   $ 2.18  
Warrants, Vested, Weighted Average Remaining Contractual Term   4 years 11 months 23 days  
Warrants, Vested, Aggregate Intrinsic Value   $ 0  
US Equity Plan [Member]      
Options, Outstanding [Roll Forward]      
Options, Outstanding, Beginning of Period (in shares) 1,044,417 1,044,417  
Options, Granted (in shares)   245,776  
Options, Exercised (in shares)   0  
Options, Forfeited (in shares)   (44,150)  
Options, Expired (in shares)   (140,635)  
Options, Outstanding, End of Period (in shares)   1,105,408  
Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Options, Outstanding. Beginning of Period (in dollars per share) $ 18.31 $ 18.31  
Options, Granted (in dollars per share)   3.22  
Options, Exercised (in dollars per share)   0  
Options, Forfeited (in dollars per share)   3.79  
Options, Expired (in dollars per share)   27.33  
Options, Outstanding, End of Period (in dollars per share)   $ 14.39  
Options, Outstanding, Weighted Average Remaining Contractual Term 6 years 21 days 6 years 2 months 26 days  
Options, Outstanding, Aggregate Intrinsic Value   $ 0 $ 0
Options, Vested and expected to vest (in shares)   1,083,355  
Options, Vested and expected to vest, Weighted Average Exercise Price (in dollars per share)   $ 14.61  
Options, Vested and expected to vest, Weighted Average Remaining Contractual Term   6 years 2 months 4 days  
Options, Vested and expected to vest, Aggregate Intrinsic Value   $ 0  
Options, Vested (in shares)   816,133  
Options, Vested, Weighted Average Exercise Price (in dollars per share)   $ 18.13  
Options, Vested, Weighted Average Remaining Contractual Term   5 years 4 months 2 days  
Options, Vested, Aggregate Intrinsic Value   $ 0