Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Property and Equipment (Details)

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Significant Accounting Policies - Property and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property plant and equipment      
Depreciation $ 1.7 $ 1.4 $ 1.1
Minimum | Property, Plant and Equipment      
Property plant and equipment      
Useful life 2 years    
Maximum | Property, Plant and Equipment      
Property plant and equipment      
Useful life 5 years