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Capital Stock - Common Stock Warrants (Details) - USD ($)
1 Months Ended 12 Months Ended
Aug. 31, 2015
Dec. 31, 2019
Jun. 30, 2019
Class of Warrant or Right [Line Items]      
Warrants to purchase (in shares)   49,997  
Class A common stock      
Class of Warrant or Right [Line Items]      
Warrants to purchase (in shares)     62,936
Common Stock Warrants | Class A common stock      
Class of Warrant or Right [Line Items]      
Exercise of warrants   62,936  
Common Stock Warrants | Series A convertible preferred stock      
Class of Warrant or Right [Line Items]      
Warrants to purchase (in shares) 62,936    
Price per share (in dollars per share) $ 0.0001    
Fair value of warrants $ 41,509