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ALLOWANCE FOR CREDIT LOSSES - ALLOWANCE FOR CREDIT LOSSES OF RECEIVABLES FROM USERS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Contract with Customer, Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning balance $ 30,875 $ 27,070 $ 34,092 $ 17,122 $ 17,122 $ 6,013
Provision for credit losses 20,342 13,985 36,745 23,933 59,134 11,109
Write-offs (15,964) 0 (35,584) 0 (42,164) 0
Ending balance $ 35,253 $ 41,055 $ 35,253 $ 41,055 $ 34,092 $ 17,122