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Equity Instruments - Conversion of Redeemable Convertible Preferred Stock into Common Stock at a conversion ratio of 3:1 and Issuance of Series??D Redeemable Convertible Preferred Stock (Details)

v3.21.2
Equity Instruments - Conversion of Redeemable Convertible Preferred Stock into Common Stock at a conversion ratio of 3:1 and Issuance of Series D Redeemable Convertible Preferred Stock (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Apr. 13, 2020
USD ($)
$ / shares
shares
Apr. 30, 2019
USD ($)
$ / shares
shares
Feb. 28, 2019
USD ($)
shares
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Temporary Equity [Line Items]                
Conversion ratio 3   1       1  
Number of shares converted | shares         4,456,248 4,456,248 893,260  
Carrying value       $ 123,704 $ 118,374 $ 123,704 $ 101,858 $ 91,826
Common stock, fair value $ 200              
Conversion of redeemable convertible preferred stock $ 13,100   $ 1,000   13,274 13,274 1,003  
Conversion of redeemable convertible preferred stock         $ (13,274) $ (13,274) $ (1,003)  
Number of shares issued | shares         75,660,962 75,660,962 3,258,288  
Original issue price per share (in usd per share) | $ / shares $ 0.37534              
Proceeds from issuance of redeemable convertible preferred stock       0 $ 28,278      
Additional Paid-In Capital                
Temporary Equity [Line Items]                
Conversion of redeemable convertible preferred stock $ 200       223 $ 223 $ 1,003  
Accumulated Deficit                
Temporary Equity [Line Items]                
Conversion of redeemable convertible preferred stock $ 13,100       $ 13,051 $ 13,051    
Series A Redeemable Convertible Preferred Stock                
Temporary Equity [Line Items]                
Conversion ratio           2.178    
Number of shares converted | shares 2,167,198              
Carrying value       $ 17,030   $ 17,030 $ 21,004  
Original issue price per share (in usd per share) | $ / shares       $ 2.928   $ 2.928 $ 2.928  
Series B Redeemable Convertible Preferred Stock                
Temporary Equity [Line Items]                
Conversion ratio           2.273    
Number of shares converted | shares 1,999,348              
Carrying value       $ 32,176   $ 32,176 $ 39,876  
Original issue price per share (in usd per share) | $ / shares       $ 3.851   $ 3.851 $ 3.851  
Series C Redeemable Convertible Preferred Stock                
Temporary Equity [Line Items]                
Conversion ratio           2.371    
Number of shares converted | shares 289,702              
Carrying value       $ 39,378   $ 39,378 $ 40,978  
Number of shares issued | shares   3,258,288            
Original issue price per share (in usd per share) | $ / shares   $ 5.52438   $ 5.524   $ 5.524 $ 5.524  
Proceeds from issuance of redeemable convertible preferred stock   $ 18,000       $ 0 $ 17,844  
Common Stock                
Temporary Equity [Line Items]                
Number of shares to be converted into | shares 1,485,413   893,260          
Number of shares issued | shares   9,227,960            
Redeemable Convertible Preferred Stock                
Temporary Equity [Line Items]                
Number of shares converted | shares     893,260          
Carrying value $ 13,300              
Conversion of redeemable convertible preferred stock $ 13,300              
Series D Redeemable Convertible Preferred Stock                
Temporary Equity [Line Items]                
Conversion ratio           1.000    
Carrying value       $ 35,120   $ 35,120    
Number of shares issued | shares 44,794,885              
Original issue price per share (in usd per share) | $ / shares       $ 0.375   $ 0.375    
Proceeds from issuance of redeemable convertible preferred stock $ 16,800         $ 28,153 $ 0