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Summary of Significant Accounting Policies - Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Advertising costs $ 2.2 $ 0.6 $ 0.2
Capitalized software $ 2.3 1.7  
Impairment of capitalized software     0.1
Capitalized software held for internal use      
Estimated useful life (in years) 3 years    
Amortized expense $ 1.1 1.0 1.2
Shipping and handling costs      
Cost of revenues $ 22.0 $ 13.3 $ 13.3