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Summary of Significant Accounting Policies - Securities (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Class of Stock [Line Items]        
Anti-dilutive securities excluded from computation (in shares) 2,402,077 1,936,279 2,402,077 1,936,279
Warrants to purchase common stock        
Class of Stock [Line Items]        
Anti-dilutive securities excluded from computation (in shares) 426,827 461,273 426,827 461,273
Common stock options        
Class of Stock [Line Items]        
Anti-dilutive securities excluded from computation (in shares) 1,975,250 1,475,006 1,975,250 1,475,006