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Debt - Expected Principal, Interest and Fee Payments on Term Loan Credit Agreement (Detail) - Term Loan Credit Agreement - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
2022, Principal	$ 20,625
2023, Principal	27,500
2024, Principal	6,875
Total, Principal	55,000	$ 40,000
2021 (remainder), Interest and Fees	3,060
2022, Interest and Fees	3,658
2023, Interest and Fees	1,654
2024, Interest and Fees	1,738
Total, Interest and Fees	10,110
2021 (remainder), Total	3,060
2022, Total	24,283
2023, Total	29,154
2024, Total	8,613
Total	$ 65,110

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