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Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets subject to amortization, net Total Intangible Assets Subject to Amortization, Net $ 20,101 $ 20,313
Accumulated amortization (20,003) (20,208)
Total intangible assets, net 98 105
Amortization charge for the year to December 31, 69 73
Cryptocurrencies Not Subject to Amortization    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets subject to amortization, net Total Intangible Assets Subject to Amortization, Net 96 100
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets subject to amortization, net Total Intangible Assets Subject to Amortization, Net 136 137
Accumulated amortization (136) (137)
Patents    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets subject to amortization, net Total Intangible Assets Subject to Amortization, Net 2,281 2,281
Accumulated amortization (2,281) (2,281)
License Agreements    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets subject to amortization, net Total Intangible Assets Subject to Amortization, Net 11,195 11,326
Accumulated amortization (11,193) (11,321)
Other Intangibles    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets subject to amortization, net Total Intangible Assets Subject to Amortization, Net 6,393 6,469
Accumulated amortization (6,393) (6,469)
Total Intangible Assets Subject to Amortization, Net    
Finite-Lived Intangible Assets [Line Items]    
Total intangible assets subject to amortization, net Total Intangible Assets Subject to Amortization, Net $ 2 $ 5