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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 $ 417 $ 574
Notes receivable allowance for credit loss $ 467 $ 467
Redeemable senior preferred stock:    
Temporary equity par value (USD per share) $ 0.001  
Temporary equity, shares authorized (in shares) 250,000  
Temporary equity, shares issued (in shares) 150,000  
Temporary equity, shares outstanding (in shares) 150,000 0
Stockholders' deficit:    
Preferred stock par value (USD per share) $ 0.001 $ 0.001
Preferred stock authorized (in shares) 100,000,000 100,000,000
Preferred stock issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock par value (USD per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 1,000,000,000.0 1,000,000,000.0
Common stock issued (in shares) 69,561,311 67,842,204
Common stock outstanding (in shares) 69,110,087 67,390,980
Treasury stock (in shares) 451,224 451,224