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Revenue Recognition - Schedule of Information about Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Revenue From Contract With Customer [Abstract]    
Receivables $ 15,751 $ 21,579
Short-term contract assets 883  
Long-term contract assets 31  
Short-term contract liabilities (deferred revenue) 1,908 2,064
Long-term contract liabilities (deferred revenue) $ 115 $ 1,798