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Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details)
12 Months Ended
Dec. 31, 2021
Building  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 39 years
Equipment Installed at Customer Sites | Minimum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 3 years
Equipment Installed at Customer Sites | Maximum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 7 years
Computer Equipment | Minimum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 3 years
Computer Equipment | Maximum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 5 years
Furniture | Minimum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 3 years
Furniture | Maximum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 10 years
Automobiles | Minimum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 3 years
Automobiles | Maximum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 7 years
Software | Minimum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 3 years
Software | Maximum  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 7 years
Leasehold Improvements  
Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives Shorter of lease term or estimated useful life