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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 63,255 $ 45,414
Accounts receivable, net 11,870 12,140
Accounts payable 2,514 3,235
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 63,255 45,414
Accounts receivable, net 11,870 12,140
Accounts payable $ 2,514 $ 3,235