Leases - Narrative (Details) - Office Right Sizing Plan - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Lessee, Lease, Description [Line Items]
Impairment loss on operating lease, right of use assets	$ 1.6	$ 1.6
R&D
Lessee, Lease, Description [Line Items]
Impairment loss on operating lease, right of use assets		0.2
S&O
Lessee, Lease, Description [Line Items]
Impairment loss on operating lease, right of use assets		1.1
G&A
Lessee, Lease, Description [Line Items]
Impairment loss on operating lease, right of use assets		$ 0.3