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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]        
Cash and cash equivalents, Carrying amount $ 33,153 $ 52,347 $ 45,570 $ 38,753
Accounts receivable, net, Carrying amount 10,347 8,760    
Accounts payable, Carrying amount 2,614 2,671    
Cash and cash equivalents, Fair value 33,153 52,347    
Accounts receivable, net, Fair value 10,347 8,760    
Accounts payable, Fair value $ 2,614 $ 2,671