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Long-term Debt - Summary of Debt (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 20, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 57,750,000 | $ 60,495,000 |
Current portion of long-term debt | 1,750,000 | 875,000 |
Total long-term debt | 59,500,000 | 61,370,000 |
Revolving Credit Facility | $150 million revolving line of credit, due January 15, 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 57,750,000 | 0 |
Principal amount of debt | 150,000,000 |  |
Revolving Credit Facility | $100 million revolving line of credit, due December 20, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0 | 49,037,000 |
Principal amount of debt | 100,000,000 |  |
Secured Debt | $20 million term loan, due February 1, 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 0 | $ 11,458,000 |
Principal amount of debt | $ 20,000,000 |  | $ 20,000,000

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