Leases - Additional Information (Detail) $ in Thousands	1 Months Ended
	Apr. 30, 2021 USD ($) ft²	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2016 ft²
Leases [Line Items]
Long-term lease liabilities		$ 1,063	$ 1,308
Other Current Liabilities
Leases [Line Items]
Operating lease, liability, current		600
Long-Term Lease Liability
Leases [Line Items]
Long-term lease liabilities		$ 1,100
Boston
Leases [Line Items]
Lease agreement, released rented office space | ft²	8,104
Lease agreement, remaining rented office space | ft²	4,153
Lease expiration period	2023-08
Operating lease, additional commitment	$ 400
King of Prussia
Leases [Line Items]
Area of leased space | ft²				19,708
Term of lease commitment				7 years 7 months