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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property and equipment, accumulated depreciation $ 17,925 $ 14,652
Common Class A    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 39,132,852 32,856,611
Common stock, shares outstanding 39,132,852 32,856,611
Common Class B    
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 125,000,000 125,000,000
Common stock, shares issued 33,724,657 38,540,095
Common stock, shares outstanding 33,724,657 38,540,095