Leases - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) a Mile	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Lessee Lease Description [Line Items]
Number of area not to use within the radius of land lease | Mile	560
Operating lease, lease payment, description	The required annual rent payments for the Premises is adjusted every three years to an amount equal to 80% of the average accounting year rent actually paid for the three previous years, with the
Number of percentage of average accounting year rent adjusted on minimum yearly rent	80.00%
Rent expense	$ 10.4	$ 10.4
Deferred percentage rent	1.6
Deferred minimum rent, additional amount	8.3
Percentage rent paid	1.6
Operating Expenses and Selling, General and Administrative Expenses [Member]
Lessee Lease Description [Line Items]
Rent expense	4.9	5.3
Short term rent expense	2.1	4.2
Accounts Payable and Accrued Expenses [Member]
Lessee Lease Description [Line Items]
Accounts payable and accrued expenses	$ 9.9
City of San Diego [Member]
Lessee Lease Description [Line Items]
Number of land lease area | a	190
Mission Bay Park, California (Premises) [Member]
Lessee Lease Description [Line Items]
Number of land lease area | a	17
Current lease term	2048-06
Rent expense	$ 0.5	$ 10.5	$ 11.2