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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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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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