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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Total Number of Shares    
Options outstanding, beginning balance (in shares) 21,520  
Granted (in shares) 186,000  
Options outstanding, ending balance (in shares) 207,520 21,520
Exercisable (in shares) 10,892  
Weighted Average Exercise Price    
Beginning balance (in dollars per share) $ 112.81  
Granted (in dollars per share) 1.87  
Ending balance (in dollars per share) 13.38 $ 112.81
Exercisable (in dollars per share) $ 129.19  
Weighted average remaining contractual term, outstanding (in years) 9 years 3 months 29 days 8 years 11 months 23 days
Weighted average remaining contractual term, options exercisable (in years) 8 years 1 month 28 days  
Aggregate Intrinsic Value    
Beginning balance $ 0  
Granted 0  
Ending balance 145 $ 0
Exercisable $ 0