Commitments and Contingencies (Details) $ in Millions		3 Months Ended
	Jan. 05, 2018 option building	Mar. 31, 2019 USD ($) Lease
Other Commitments [Line Items]
Sale Leaseback Transaction, Number Of Buildings	2
Number Of Buildings	4
Sale Leaseback Transaction, Lease Term	15 years
Lessee, Sale Leaseback, Option To Extend, Number | option	2
Lessee, Sale Leaseback, Renewal Term	5 years
Operating Leases, Future Minimum Payments Due | $		$ 18.4
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest		25.00%
San Diego [Member]
Other Commitments [Line Items]
Number Of Extension | Lease		3
Lessor, Operating Lease, Option to Extend		P5Y