Commitments and Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($) ft²	Dec. 31, 2017 USD ($) Lease	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) ft²
Sale Leaseback Transaction [Line Items]
Rent expense under operating leases	$ 2,300	$ 2,100	$ 2,200
Lease expiration year		2022
Number of extension | Lease		2
Extend the lease options		5 years
Lease incentives for tenant improvements		$ 1,700
Facility sold		15,000
Capital contributed		3,800
Cash transaction, netting		$ 7,000
Partnership that acquired the facility		25.00%
Lease payments		$ 900	900	$ 1,100
Purchase Commitment, Remaining Minimum Amount Committed		5,900
Accrued in other current liabilities		12,666	5,097
Amortization expense		16,100	9,500	10,200
Company had royalty and license expenses relating to those agreements		$ 600	$ 800	$ 500
San Diego [Member]
Sale Leaseback Transaction [Line Items]
Lease term period		Dec. 01, 2019
Number of extension | Lease		3
Extend the lease options		5 years
Amended terms		10 years
Property Subject to Operating Lease [Member]
Sale Leaseback Transaction [Line Items]
Area under new operating lease | ft²	30,000			30,000