Leases - Summary of Components of Operating Lease Expense (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Lessee Lease Description [Line Items]
Total operating lease expense	$ 276
Research and Development Expense [Member]
Lessee Lease Description [Line Items]
Fixed operating lease expense	164
Variable operating lease expense	17
General and Administrative Expense [Member]
Lessee Lease Description [Line Items]
Fixed operating lease expense	86
Variable operating lease expense	$ 9