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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment
December 31,
Useful Lives (years)20202019
Leasehold improvementsShorter of lease term or economic life$29,558 $28,141 
Website and software development costs
2-3
33,278 27,602 
Computer and office equipment37,765 4,846 
Software31,858 595 
Furniture77,450 6,965 
Property and equipment, gross79,909 68,149 
Accumulated depreciation and amortization(41,614)(29,047)
Construction in progress5,693 475 
Property and equipment, net$43,988 $39,577