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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Carrying Amount    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 28,790 $ 33,153
Accounts receivable, net 11,717 10,347
Accounts payable 2,911 2,614
Fair Value    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash and cash equivalents 28,790 33,153
Accounts receivable, net 11,717 10,347
Accounts payable $ 2,911 $ 2,614