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Schedule of Estimated Revenue Expected to be Recognized in Future Related to Performance Obligations (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Remainder of 2018  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation $ 2,256
2019  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation 6,730
2020  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation 3,000
2021  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation $ 1,500