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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 50,224 $ 45,414
Accounts receivable, net 13,433 12,140
Accounts payable 3,498 3,235
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 50,224 45,414
Accounts receivable, net 13,433 12,140
Accounts payable $ 3,498 $ 3,235