Leases - Additional Information (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jul. 07, 2020 ft²	Dec. 31, 2019 USD ($)
Operating lease right of use assets	$ 25,176	$ 25,176		$ 25,707
Operating lease liabilities	31,679	31,679		$ 30,552
Increase in operating lease liabilities		$ 3,000
Marlborough Massachusetts [Member]
Increase in right of use asset	2,800
Increase in operating lease liabilities	$ 2,800
Expansion of existing premises | ft²			66,939