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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]        
Cash and cash equivalents, Carrying amount $ 52,347 $ 45,570 $ 38,753 $ 63,777
Accounts receivable, net, Carrying amount 8,760 8,747    
Accounts payable, Carrying amount 2,671 3,850    
Cash and cash equivalents, Fair value 52,347 45,570    
Accounts receivable, net, Fair value 8,760 8,747    
Accounts payable, Fair value $ 2,671 $ 3,850