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Stockholders' Equity (Deficit) - Distributions Declared (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Series A Non-Redeemable Convertible Preferred Stock      
Class of Stock [Line Items]      
Non-Redeemable Preferred Units $ 18,098 $ 4,813 $ 3,500
Series B Non-Redeemable Convertible Preferred Stock      
Class of Stock [Line Items]      
Non-Redeemable Preferred Units 34,802 9,252 6,789
Series C Redeemable Convertible Preferred Stock      
Class of Stock [Line Items]      
Redeemable Preferred Units $ 40,689 $ 11,058 $ 9,066