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Stockholders' Equity (Deficit) - Preferred Units Outstanding (Details)
$ / shares in Units, $ in Thousands
Dec. 31, 2019
USD ($)
$ / shares
shares
Preferred Units [Line Items]  
Preferred units, authorized (in units) 50,965,118,000
Preferred units, issued and outstanding (in units) 50,965,118,000
Series A Non-Redeemable Convertible Preferred Stock  
Preferred Units [Line Items]  
Preferred units, authorized (in units) 9,941,227,000
Preferred units, issued and outstanding (in units) 9,941,227,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares $ 0.50
Preferred stock, aggregate liquidation preference | $ $ 4,971
Preferred stock, redemption price per share (in dollars per share) | $ / shares $ 0.25
Series B Non-Redeemable Convertible Preferred Stock  
Preferred Units [Line Items]  
Preferred units, authorized (in units) 19,117,039,000
Preferred units, issued and outstanding (in units) 19,117,039,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares $ 0.50
Preferred stock, aggregate liquidation preference | $ $ 9,559
Preferred stock, redemption price per share (in dollars per share) | $ / shares $ 0.25
Series C Redeemable Convertible Preferred Stock  
Preferred Units [Line Items]  
Preferred units, authorized (in units) 21,906,852,000
Preferred units, issued and outstanding (in units) 21,906,852,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares $ 1.8259
Preferred stock, aggregate liquidation preference | $ $ 40,090
Preferred stock, redemption price per share (in dollars per share) | $ / shares $ 1.83