Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Assets (Detail)	3 Months Ended
	Mar. 31, 2020
Computer Equipment and Software [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	3 years
Laboratory Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	3 years
Laboratory Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	7 years
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	3 years
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	shorter of 8 years and remaining life of lease
Leasehold Improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives of assets	8 years