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Lease Assets - Additional Information (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about quantitative information about leases for lessee [Line Items]    
Weighted average discount rate 7.23%  
Bottom of range | Office space    
Disclosure of detailed information about quantitative information about leases for lessee [Line Items]    
Lease term 1 year  
Bottom of range | Office equipment    
Disclosure of detailed information about quantitative information about leases for lessee [Line Items]    
Lease term 1 year  
Bottom of range | IT and other equipment    
Disclosure of detailed information about quantitative information about leases for lessee [Line Items]    
Lease term 1 year  
Top of range | Office space    
Disclosure of detailed information about quantitative information about leases for lessee [Line Items]    
Lease term 20 years  
Top of range | Office equipment    
Disclosure of detailed information about quantitative information about leases for lessee [Line Items]    
Lease term 7 years  
Top of range | IT and other equipment    
Disclosure of detailed information about quantitative information about leases for lessee [Line Items]    
Lease term 5 years  
Weighted average | Office space    
Disclosure of detailed information about quantitative information about leases for lessee [Line Items]    
Lease term 7 years 1 month 6 days 7 years 8 months 12 days
Weighted average | Office equipment    
Disclosure of detailed information about quantitative information about leases for lessee [Line Items]    
Lease term 2 years 6 months 2 years 2 months 12 days