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Stockholders' Equity - Warrants (Details) - $ / shares
 6 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Number of Warrants    
Balance of warrants outstanding at the end of the period (in shares)   7,373,351
Granted (in shares)   5,831,451
Exercised (in shares)   (9,047,582)
Balance of warrants outstanding at the beginning of the period (in shares) 10,589,482 10,589,482
Weighted Average Exercise Price Per Share    
Weighted average exercise price of warrants at the beginning of the period (in USD per share) $ 4.08 $ 4.08
Granted (in USD per share)   1.70
Exercised (in USD per share)   2.17
Weighted average exercise price of warrants at the end of the period (in USD per share)   $ 4.54
Term    
Weighted-Average Remaining Contractual Term 3 years 8 months 12 days 4 years 3 months 18 days
Pre-Funded Warrants    
Number of Warrants    
Granted (in shares)   992,039