Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) ft²	Jan. 31, 2020 USD ($) ft²	Jan. 30, 2020 ft²
Commitments And Contingencies Disclosure [Abstract]
Area of office and laboratory | ft²	37,438	21,539	37,438
Amended operating lease expiration date	Jan. 31, 2020
Reduced area of office and laboratory | ft²		15,899
Reduction of lease liability and corresponding right-of-use asset | $		$ 2.0
Lease liabilities | $	$ 0.3