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Digital Assets, Net (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Indefinite-lived Intangible Assets [Line Items]          
Impairment of indefinite-lived intangible assets   $ 117 $ 0 $ 183 $ 0
Bitcoin          
Indefinite-lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets acquired $ 1,000     1,000  
Impairment of indefinite-lived intangible assets   100   200  
Indefinite-lived intangible assets (excluding goodwill)   800   800  
Impairment losses   200   200  
Indefinite-lived intangible assets (excluding goodwill), fair value disclosure   $ 1,200   $ 1,200