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Significant Accounting Policies - Property and Equipment Estimated Useful Lives (Details)
 12 Months Ended
Dec. 31, 2020
Computer and Other Equipment  
Disclosure Of Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 4 years
Furniture and Fixtures  
Disclosure Of Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 4 years
Vehicles  
Disclosure Of Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 4 years
Leasehold Improvements  
Disclosure Of Property Plant And Equipment [Line Items]  
Property and equipment, estimated useful lives 4 years