Registration statement for securities of certain foreign private issuers

Summary of Significant Accounting Policies - Estimated Useful Life of Assets (Detail)

v3.20.1
Summary of Significant Accounting Policies - Estimated Useful Life of Assets (Detail)
 12 Months Ended
Dec. 31, 2019
Leasehold Improvements [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives Term of the lease
Computer equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 3 years
Bottom of range [member] | Furniture and fixture [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 3 years
Top of range [member] | Furniture and fixture [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 5 years