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Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Temporary Equity [Line Items]    
Shares Authorized (in shares) 0 24,069,615
Shares Issued (in shares) 0 21,233,190
Shares Outstanding (in shares) 0 21,233,190
Preferential Liquidation Value (in thousands) $ 0 $ 121,144,000
Carrying Value (in thousands) $ 0 $ 105,235,000
Series A    
Temporary Equity [Line Items]    
Shares Authorized (in shares)   1,629,629
Shares Issued (in shares)   1,629,626
Shares Outstanding (in shares)   1,629,626
Per share Preference (in USD per share)   $ 2.70
Preferential Liquidation Value (in thousands)   $ 4,400,000
Carrying Value (in thousands)   $ 4,369,000
Series A-1    
Temporary Equity [Line Items]    
Shares Authorized (in shares)   1,111,111
Shares Issued (in shares)   1,111,109
Shares Outstanding (in shares)   1,111,109
Per share Preference (in USD per share)   $ 3.38
Preferential Liquidation Value (in thousands)   $ 3,755,000
Carrying Value (in thousands)   $ 3,723,000
Series B    
Temporary Equity [Line Items]    
Shares Authorized (in shares)   6,264,470
Shares Issued (in shares)   6,264,463
Shares Outstanding (in shares)   6,264,463
Per share Preference (in USD per share)   $ 6.11
Preferential Liquidation Value (in thousands)   $ 38,276,000
Carrying Value (in thousands)   $ 38,014,000
Series C    
Temporary Equity [Line Items]    
Shares Authorized (in shares)   15,064,405
Shares Issued (in shares)   12,227,992
Shares Outstanding (in shares)   12,227,992
Per share Preference (in USD per share)   $ 6.11
Preferential Liquidation Value (in thousands)   $ 74,713,000
Carrying Value (in thousands)   $ 59,129,000