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Stock-Based Compensation - Stock Incentive Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based payment awards |  |  |
Shares withheld to cover tax withholding (in shares) | 236,752 | 212,080 | 167,382
Shares withheld to cover tax withholding (in dollars) | $ 1,804 | $ 2,007 | $ 1,759
2020 Plan |  |  |
Stock-based payment awards |  |  |
Number of shares authorized for issuance | 8,500,000 |  |
Reduction in number of shares available for issuance for each stock-settled award granted | 1 |  |

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- Definition The reduction in number of shares available for issuance for each stock-settled award granted under the Plan. + References No definition available. + Details
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- Definition Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement. + 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 Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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