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Subsequent Events - Warrants Exercised (Details) - Subsequent Event - Warrants to purchase common stock
1 Months Ended
Oct. 31, 2019
$ / shares
shares
Subsequent Event [Line Items]  
Warrants exercised (in shares) 482,661
Shares issued (in shares) 441,307
Weighted Average  
Subsequent Event [Line Items]  
Exercise price (in dollars per share) | $ / shares $ 1.59