Quarterly report pursuant to Section 13 or 15(d)

Cryptocurrencies (Summary of Additional Information About Cryptocurrencies) (Details)

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Cryptocurrencies (Summary of Additional Information About Cryptocurrencies) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]  
Beginning balance - January 1, 2021 $ 11,626
Revenue recognized from cryptocurrencies mined 54,623
Mining pool operating fees (484)
Proceeds from sale of cryptocurrencies (33)
Realized gain on sale/exchange of cryptocurrencies 29
Impairment of cryptocurrencies (17,507)
Ending balance - June 30, 2021 $ 48,254