Leases - Additional Information (Details) ft² in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 ft² term	Dec. 31, 2011 ft² lease building	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Option to extend lease term						15 years
Sublease income 2018 | $		$ 6.2
Rental expense | $		$ 17.3	$ 19.2
Corporate Headquarters
Lessee, Lease, Description [Line Items]
Number of leases | lease					2
Area of real estate property (in square feet) | ft²					1,100
Lease agreements number of buildings | building					2
Option to extend lease term					15 years
Optional term of lease agreement (in years)					10 years
San Diego Lease
Lessee, Lease, Description [Line Items]
Area of real estate property (in square feet) | ft²				170
Length of lease				16 years
Amount of optional renewal terms | term				2
Optional renewal term length				5 years
Minimum
Lessee, Lease, Description [Line Items]
Capital leases, imputed interest rate	1.00%
Maximum
Lessee, Lease, Description [Line Items]
Capital leases, imputed interest rate	6.00%
Buildings
Lessee, Lease, Description [Line Items]
Property and equipment useful life	40 years