Leases - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) a	Jun. 30, 2019 USD ($) a Mile	Dec. 31, 2018 USD ($)
Lessee Lease Description [Line Items]
Number of area not to use within the radius of land lease | Mile		560
Estimated incremental borrowing rate	8.20%	8.20%
Operating lease, lease payment, description		The minimum yearly rent is adjusted every three years to an amount equal to 80% of the average accounting year rent actually paid for the three previous years.
Number of percentage of average accounting year rent adjusted on minimum yearly rent		80.00%
Rent expense	$ 10,400	$ 10,400	$ 16,578
Operating lease payments related to options to extend lease terms		7,200
Operating Expenses and Selling, General and Administrative Expenses [Member]
Lessee Lease Description [Line Items]
Short term rent expense	1,100	1,900
ASU 2016-02 [Member]
Lessee Lease Description [Line Items]
Lease asset net balance reclassified	$ 14,000	$ 14,000
City of San Deigo [Member]
Lessee Lease Description [Line Items]
Number of land lease area | a	190	190
Mission Bay Park, California (Premises) [Member]
Lessee Lease Description [Line Items]
Number of land lease area | a	17	17
Current lease term		2048-06
Rent expense	$ 3,000	$ 4,700
Maximum [Member]
Lessee Lease Description [Line Items]
Term of lease	12 months	12 months
Lease renewal term	10 years	10 years
Minimum [Member]
Lessee Lease Description [Line Items]
Lease renewal term	1 year	1 year