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SUBSEQUENT EVENTS (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 13, 2021
USD ($)
Aug. 02, 2021
USD ($)
vote
$ / shares
shares
Jun. 30, 2021
USD ($)
vote
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
vote
shares
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
vote
shares
Dec. 31, 2019
USD ($)
shares
Subsequent Event [Line Items]                
Number of voting rights per share | vote     1   1   1  
Common stock, shares outstanding (in shares)     232,609,957   232,609,957   229,031,546 224,802,545
Deferred offering costs | $     $ 9,500   $ 9,500   $ 1,300  
Share-based compensation | $     $ 1,138 $ 1,365 $ 10,134 $ 3,777 $ 24,330 $ 26,667
Subsequent Event | Say                
Subsequent Event [Line Items]                
Purchase price in cash | $ $ 140,000              
Subsequent Event | IPO                
Subsequent Event [Line Items]                
Deferred offering costs | $   $ 13,400            
Subsequent Event | IPO | RSUs                
Subsequent Event [Line Items]                
Share-based compensation | $   $ 1,000,000            
Subsequent Event | Common Class A                
Subsequent Event [Line Items]                
Number of voting rights per share | vote   1            
Subsequent Event | Common Class A | IPO                
Subsequent Event [Line Items]                
Shares issued in IPO (in shares)   55,000,000            
Offering price in IPO (in dollars per share) | $ / shares   $ 38.00            
Net proceeds from sale in IPO | $   $ 1,900,000            
Conversion of Stock, Shares Converted   130,155,246            
Conversion of convertible preferred stock (in shares)   412,742,897            
Convertible notes converted to common stock (in shares)   137,305,156            
Exercise price (in dollars per share) | $ / shares   $ 26.60            
Aggregate warrants exercisable (in shares)   14,278,034            
Subsequent Event | Common Class A | IPO - Shares from Company                
Subsequent Event [Line Items]                
Shares issued in IPO (in shares)   52,375,000            
Subsequent Event | Common Class A | IPO - Shares from Existing Shareholders                
Subsequent Event [Line Items]                
Shares issued in IPO (in shares)   2,625,000            
Subsequent Event | Common Class B                
Subsequent Event [Line Items]                
Number of voting rights per share | vote   10            
Subsequent Event | Common Class C                
Subsequent Event [Line Items]                
Number of voting rights per share | vote   0            
Common stock, shares outstanding (in shares)   0