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OTHER CONSOLIDATED BALANCE SHEET COMPONENTS (NON-CURRENT) - Other Non-Current Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Acquired Indefinite-lived Intangible Assets [Line Items]            
Investment in non-marketable equity securities $ 82,181   $ 32,510   $ 82,181  
Investment in marketable equity security 0   376,258   0  
Investment in bitcoin 148,910   50,000   148,910  
Restricted cash 73,420   13,526 $ 13,702 73,420 $ 13,702
Other 79,997   26,956   79,997  
Total 384,508   499,250   384,508  
Investment in non-marketable equity securities, net loss from revaluation 6,800       6,800  
Investment in marketable security, gain on sale         44,400  
Bitcoin impairment losses 6,000     $ 0 71,126 $ 0
Investment in bitcoin loaned to third party borrowers 6,000       6,000  
Bitcoin            
Acquired Indefinite-lived Intangible Assets [Line Items]            
Indefinite-lived intangible asset acquired   $ 170,000 $ 50,000      
Bitcoin impairment losses 6,000       71,100  
Fair value of bitcoin investment 351,700       351,700  
Amount of fair value in excess of carrying value for bitcoin investment $ 202,800       $ 202,800