| Subsequent Event (Details) - Subsequent event - Line of credit - Revolving credit facility | Feb. 03, 2021  USD ($) | 
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| Loss Contingencies [Line Items] | |
| Maximum borrowing capacity | $ 100,000,000 | 
| Maximum borrowing capacity, including accordion feature | $ 200,000,000 | 
| LIBOR | Minimum | |
| Loss Contingencies [Line Items] | |
| Credit agreement, basis spread on variable rate | 1.50% | 
| LIBOR | Maximum | |
| Loss Contingencies [Line Items] | |
| Credit agreement, basis spread on variable rate | 2.25% | 
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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Including Accordion Feature No definition available. 
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. No definition available. 
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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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. No definition available. 
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