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Debt - Expected Principal, Interest and Fee Payments on Term Loan Credit Agreement (Detail) - Term Loan Credit Agreement - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
2022, Principal | $ 15,000 |
2023, Principal | 20,000 |
2024, Principal | 5,000 |
Total, Principal | 40,000 | $ 40,000
2021, Interest and Fees | 3,041 |
2022, Interest and Fees | 2,660 |
2023, Interest and Fees | 1,203 |
2024, Interest and Fees | 1,264 |
Total, Interest and Fees | 8,168 |
2021, Total | 3,041 |
2022, Total | 17,660 |
2023, Total | 21,203 |
2024, Total | 6,264 |
Total | $ 48,168 |

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