Debt - Expected Principal, Interest and Fee Payments on Term Loan Credit Agreement (Detail) - Term Loan Credit Agreement - USD ($) $ in Thousands	Mar. 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
2020 (remainder), Interest and Fees	2,291
2021, Interest and Fees	3,042
2022, Interest and Fees	2,660
2023, Interest and Fees	1,203
2024, Interest and Fees	1,264
Total, Interest and Fees	10,460
2020 (remainder), Total	2,291
2021, Total	3,042
2022, Total	17,660
2023, Total	21,203
2024, Total	6,264
Total	$ 50,460