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Preferred Stock - Convertible preferred stock (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Preferred Stock                
Preferred Stock Authorized 51,981,513     41,053,358        
Preferred Stock Issued 51,450,435     40,524,346        
Preferred Stock Outstanding 51,450,435     40,524,346        
Carrying Value $ 84,761     $ 55,370        
Liquidation Preference $ 76,619     $ 57,161        
Common Stock Issuable Upon Conversion 15,906,537     12,528,612        
Series A convertible preferred stock                
Preferred Stock                
Preferred Stock Authorized 3,067,519     3,067,519        
Preferred Stock Issued 2,819,027     2,819,027        
Preferred Stock Outstanding 2,819,027 2,819,027 2,819,027 2,819,027 2,819,027 2,819,027 2,819,027 2,819,027
Carrying Value $ 4,616 $ 4,616 $ 4,616 $ 4,616 $ 4,616 $ 4,589 $ 4,501 $ 4,413
Liquidation Preference $ 5,051     $ 4,766        
Common Stock Issuable Upon Conversion 871,541     871,541        
Series A-1 convertible preferred stock                
Preferred Stock                
Preferred Stock Authorized 3,970,776     3,970,776        
Preferred Stock Issued 3,730,366     3,730,366        
Preferred Stock Outstanding 3,730,366 3,730,366 3,730,366 3,730,366 3,730,366 3,730,366 3,730,366 3,730,366
Carrying Value $ 5,398 $ 5,398 $ 5,398 $ 5,398 $ 5,398 $ 5,364 $ 5,262 $ 5,160
Liquidation Preference $ 5,906     $ 5,572        
Common Stock Issuable Upon Conversion 1,153,290     1,153,290        
Series A-2 convertible preferred stock                
Preferred Stock                
Preferred Stock Authorized 3,565,063     3,565,063        
Preferred Stock Issued 3,565,063     3,565,063        
Preferred Stock Outstanding 3,565,063 3,565,063 3,565,063 3,565,063 3,565,063 3,565,063 3,565,063 3,565,063
Carrying Value $ 5,809 $ 5,809 $ 5,809 $ 5,809 $ 5,809 $ 5,774 $ 5,663 $ 5,552
Liquidation Preference $ 6,355     $ 5,997        
Common Stock Issuable Upon Conversion 1,102,182     1,102,182        
Series B convertible preferred stock                
Preferred Stock                
Preferred Stock Authorized 30,450,000     30,450,000        
Preferred Stock Issued 30,409,890     30,409,890        
Preferred Stock Outstanding 30,409,890 30,409,890 30,409,890 30,409,890 30,409,890 30,409,890 30,409,890 30,409,890
Carrying Value $ 39,547 $ 39,547 $ 39,547 $ 39,547 $ 39,547 $ 39,306 $ 38,554 $ 37,802
Liquidation Preference $ 43,269     $ 40,826        
Common Stock Issuable Upon Conversion 9,401,599     9,401,599        
Series B-1 convertible preferred stock                
Preferred Stock                
Preferred Stock Authorized 10,928,155     0        
Preferred Stock Issued 10,926,089     0        
Preferred Stock Outstanding 10,926,089 10,926,089   0        
Carrying Value $ 29,391 $ 29,391            
Liquidation Preference $ 16,038              
Common Stock Issuable Upon Conversion 3,377,925