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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 75,959 $ 70,637
Accounts receivable, net 15,106 10,731
Accounts payable 4,502 2,632
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 75,959 70,637
Accounts receivable, net 15,106 10,731
Accounts payable $ 4,502 $ 2,632