Quarterly report pursuant to Section 13 or 15(d)

Summary of Revenues Disaggregated by Timing of Goods and Services Transferred (Detail)

v3.8.0.1
Summary of Revenues Disaggregated by Timing of Goods and Services Transferred (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation Of Revenue [Line Items]    
Net revenue $ 10,020 $ 10,874
Revenue Recognized Over Time    
Disaggregation Of Revenue [Line Items]    
Net revenue 1,697  
Revenue Recognized at a Point in Time    
Disaggregation Of Revenue [Line Items]    
Net revenue $ 8,323