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Leases - Narrative (Details) ft² in Thousands, $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Jul. 01, 2020 USD ($) ft² extensionPeriod | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |
Right-of-use asset |  | $ 8,117 |  | $ 8,606
Lease liability |  | 7,991 |  |
Operating lease, cash payments |  | $ 1,721 | $ 1,717 |
Chicago |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Lease area | ft² | 30 |  |  |
Contract term | 10 years |  |  |
Number of extensions | extensionPeriod | 2 |  |  |
Renewal term | 5 years |  |  |
Annual rent payment initial twelve months | $ 1,113 |  |  |
Base rent annual percentage increase | 3.00% |  |  |
Estimated rental payment over original term | $ 12,761 |  |  |
Letters of credit outstanding | 1,200 |  |  |
Rental payment adjusted for abatement | 87 |  |  |
Payments for tenant improvements | 697 |  |  |
Right-of-use asset | 8,931 |  |  |
Lease liability | $ 8,147 |  |  |
Incremental borrowing rate | 8.30% |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease renewal, 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=123408670&loc=SL77918673-209980 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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