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Debt - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 12, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Line of Credit Facility |  |  |  |  |  |
Line of credit maximum borrowing amount |  | $ 300,000,000 |  | $ 300,000,000 |  | $ 300,000,000
Debt amortization expense |  | $ 42,000 | $ 42,000 | $ 126,000 | $ 126,000 |
Revolving Credit Facility Due 2024 |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Line of credit maximum borrowing amount | $ 300,000,000 |  |  |  |  |
Line of credit facility contingent increase to maximum borrowing capacity | $ 150,000,000 |  |  |  |  |
Commitment fee percentage per annum |  |  |  | 0.20% |  | 0.23%
Revolving Credit Facility Due 2024 | Minimum |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Commitment fee percentage per annum | 0.20% |  |  |  |  |
Revolving Credit Facility Due 2024 | Maximum |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Commitment fee percentage per annum | 0.30% |  |  |  |  |
Revolving Credit Facility Due 2024 Swingline Sublimit |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Line of credit maximum borrowing amount | $ 15,000,000 |  |  |  |  |
Revolving Credit Facility Due 2024 Letter Of Credit Sublimit |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Line of credit maximum borrowing amount | $ 10,000,000 |  |  |  |  |
Line of Credit | Revolving Credit Facility Due 2024 |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |

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- Definition Increased maximum borrowing capacity under the credit facility if any one or more of the existing banks or new banks agree to provide such increased commitment amount. + References No definition available. + Details
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X
- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Balance Type: | na
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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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 Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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