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Subsequent Events - Options Exercised (Details) - $ / shares
1 Months Ended 9 Months Ended
Oct. 31, 2019
Sep. 30, 2019
Subsequent Event [Line Items]    
Shares issued upon exercise of options (in shares)   4,917,057
Average exercise price of options (in dollars per share)   $ 1.02
Subsequent Event    
Subsequent Event [Line Items]    
Shares issued upon exercise of options (in shares) 1,311,944  
Average exercise price of options (in dollars per share) $ 0.94