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BASIS OF PRESENTATION, Summary of Financial Information of VIEs Before Eliminating Intercompany Balances and Transactions Between VIEs and Other Entities within Group (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Current assets [Abstract]      
Cash and cash equivalents $ 4,645,383 $ 6,166,880  
Total current assets 9,397,098 8,939,004  
Non-current assets [Abstract]      
Property and equipment, net 442,122 386,401  
Long-term investments 286,372 190,482  
Deferred tax assets 114,862 99,904  
Total non-current assets 2,125,949 1,516,667  
Total assets 11,523,047 10,455,671  
Current liabilities [Abstract]      
Accrued expenses and other payables 2,670,816 2,033,461  
Deferred revenue 2,538,838 2,150,165  
Total current liabilities 5,883,597 4,636,067  
Non-current liabilities [Abstract]      
Deferred revenue 396,138 343,297  
Total non-current liabilities 2,040,525 2,399,365  
Total liabilities 7,924,122 7,035,432  
Revenue [Abstract]      
Revenue 4,044,192   $ 1,596,954
Net loss (855,760) (949,831) (674,326)
VIEs [Member]      
Current assets [Abstract]      
Cash and cash equivalents 97,396 94,502  
Amounts due from intercompanies [1] 141,878 44,928  
Others 66,892 79,484  
Total current assets 306,166 218,914  
Non-current assets [Abstract]      
Property and equipment, net 33,988 35,453  
Long-term investments 17,313 16,080  
Deferred tax assets 48,776 47,948  
Others 23,682 37,662  
Total non-current assets 123,759 137,143  
Total assets 429,925 356,057  
Current liabilities [Abstract]      
Accrued expenses and other payables 112,185 91,186  
Deferred revenue 204,926 212,377  
Amounts due to intercompanies [1] 116,898 70,019  
Others 28,104 31,104  
Total current liabilities 462,113 404,686  
Non-current liabilities [Abstract]      
Deferred revenue 70,953 55,200  
Amounts due to intercompanies [1] 30,910 15,710  
Others 6,759 18,418  
Total non-current liabilities 108,622 89,328  
Total liabilities 570,735 $ 494,014  
Revenue [Abstract]      
Net loss (19,089)   (28,770)
Net cash generated from (used in) operating activities (12,218)   59,030
Net cash (used in) generated from investing activities 500   (25,122)
Net cash generated from financing activities 14,025   32,220
VIEs [Member] | Third Party Customers [Member]      
Revenue [Abstract]      
Revenue 333,847   262,801
VIEs [Member] | Intercompanies [Member]      
Revenue [Abstract]      
Revenue $ 84,876   $ 70,363
[1] Amounts due from or to intercompanies consist of intercompany receivables or payables to the other companies within the group arising from intercompany transactions and funds advanced for working capital purpose.