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MEZZANINE EQUITY, COMMON STOCK AND STOCKHOLDERS’ DEFICIT - SCHEDULE OF STOCK OPTION ACTIVITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares      
Beginning balance (in shares) 21,543,828 27,613,830  
Granted during the period (in shares)   324,442  
Exercised during the period (in shares) (3,581,521) (4,310,197)  
Cancelled and forfeited during the period (in shares) (276,657) (2,084,247)  
Ending balance (in shares) 17,685,650 21,543,828 27,613,830
Options vested and expected to vest (in shares) 17,685,650 21,543,828  
Options exercisable (in shares) 15,905,386 18,793,618  
Weighted-Average Exercise Price      
Beginning balance, Weighted-Average Exercise Price (in dollars per share) $ 2.19 $ 2.33  
Granted during the period, Weighted-Average Exercise Price (in dollars per share)   10.10  
Exercised during the period, Weighted-Average Exercise Price (in dollars per share) 1.87 2.20  
Cancelled and forfeited during the period, Weighted-Average Exercise Price (in dollars per share) 4.51 5.18  
Ending balance, Weighted-Average Exercise Price (in dollars per share) 2.22 2.19 $ 2.33
Options vested and expected to vest, Weighted-Average Exercise Price (in dollars per share) 2.22 2.19  
Options exercisable, Weighted-Average Exercise Price (in dollars per share) $ 1.75 $ 1.58  
Weighted- Average Remaining Life      
Weighted- Average Remaining Life 5 years 9 months 3 days 6 years 6 months 7 days 7 years 7 months 2 days
Options vested and expected to vest, Weighted-Average Remaining Life 5 years 9 months 3 days 6 years 6 months 7 days  
Options exercisable, Weighted-Average Remaining Life 5 years 6 months 21 days 6 years 3 months 21 days  
Total Intrinsic Value (in thousands)      
Total Intrinsic Value (in thousands) $ 632,774 $ 304,590 $ 197,536
Options vested and expected to vest, Total Intrinsic Value 632,774 304,590  
Options exercisable, Total Intrinsic Value $ 576,535 $ 277,127