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v3.20.4

Leases (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) ft² | Dec. 31, 2018 USD ($)
Lessee Lease [Line Items] |  |
Rent expense |  | $ 6.0
Sublease income recognized |  | $ 0.3
Downers Grove [Member] |  |
Lessee Lease [Line Items] |  |
Area of office space sublet | ft² | 21,000 |
Frisco Corporate Headquarter [Member] |  |
Lessee Lease [Line Items] |  |
Lease agreement term | 11 years |
Area of space after expand | ft² | 75,000 |
Increase in the operating lease asset, net | $ 17.0 |
Increase in operating lease liability | $ 22.6 |
Frisco Corporate Headquarter [Member] | Frisco [Member] |  |
Lessee Lease [Line Items] |  |
Area of office space sublet | ft² | 12,000 |

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=121580752&loc=d3e38371-112697 + Details
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