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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets    
Accounts receivable, allowance for credit loss, current $ 3,891 $ 3,933
Stockholders' equity (deficit)    
Preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Preferred stock, authorized (in shares) 50,000,000 0
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.00001  
Common stock, authorized (in shares) 1,450,000,000  
Treasury stock (in shares) 195,000 195,000
Series A Preferred Stock    
Redeemable convertible preferred stock    
Redeemable convertible preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Redeemable convertible preferred stock, authorized (in shares) 0 2,271,000
Redeemable convertible preferred stock, issued (in shares) 0 2,271,000
Redeemable convertible preferred stock, outstanding (in shares) 0 2,271,000
Series B Preferred Stock    
Redeemable convertible preferred stock    
Redeemable convertible preferred stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Redeemable convertible preferred stock, authorized (in shares) 0 6,151,000
Redeemable convertible preferred stock, issued (in shares) 0 6,031,000
Redeemable convertible preferred stock, outstanding (in shares) 0 6,031,000
Common Class A    
Stockholders' equity (deficit)    
Common stock, par value (in dollars per share) $ 0.00001 $ 0.00001
Common stock, authorized (in shares) 700,000,000 0
Common stock, issued (in shares) 82,714,000 0
Common stock, outstanding (in shares) 82,714,000 0
Common Class B    
Stockholders' equity (deficit)    
Common stock, par value (in dollars per share) $ 0.00001  
Common stock, authorized (in shares) 700,000,000 137,800,000
Common stock, issued (in shares) 32,231,000 78,283,000
Common stock, outstanding (in shares) 32,036,000 78,088,000