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Leases - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) option	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) option	Sep. 30, 2018 USD ($)	May 26, 2017 ft²	Jan. 09, 2013 ft²
Lessee, Lease, Description [Line Items]
Number of renewal options | option	2		2
Operating lease, cost | $	$ 0.0	$ 0.2	$ 0.0	$ 0.5
Operating lease, payments | $	$ 0.0	$ 0.1	$ 0.0	$ 0.4
Operating lease, weighted average remaining lease term (years)	6 years 5 months 9 days		6 years 5 months 9 days
Operating lease, weighted average discount rate (percent)	4.53%		4.53%
MacAndrews & Forbes
Lessee, Lease, Description [Line Items]
Area of real estate property (in sq ft) | ft²						6,676
New HQ Lease | MacAndrews & Forbes
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term (years)					10 years
Area of real estate property (in sq ft) | ft²					3,200
One
Lessee, Lease, Description [Line Items]
Length of renewal options (years)			2 years
Two
Lessee, Lease, Description [Line Items]
Length of renewal options (years)			3 years

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Area of a real estate property.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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