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Summary of Receivables and Deferred Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Balances from contracts with customers only:    
Accounts receivable $ 33,015 $ 27,585
Deferred revenue 1,290  
Revenue recognized during the three month period relating to:    
The beginning deferred revenue balance 422  
Changes in pricing related to products or services satisfied in previous periods $ 0