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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Allowance $ 196 $ 313
Class A common stock    
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock, issued (in shares) 94,251,161 91,317,225
Common stock, outstanding (in shares) 78,792,505 76,734,106
Class B common stock    
Common stock par value (in dollars per share) $ 0.001 $ 0.001
Common stock, issued (in shares) 105,451,261 106,165,105
Common stock, outstanding (in shares) 105,451,261 106,165,105