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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 64,747 $ 70,637
Accounts receivable, net 16,858 10,731
Accounts payable 3,057 2,632
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 64,747 70,637
Accounts receivable, net 16,858 10,731
Accounts payable $ 3,057 $ 2,632