Quarterly report pursuant to Section 13 or 15(d)

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

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Summary of Revenues Disaggregated by Timing of Goods and Services Transferred (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation Of Revenue [Line Items]        
Net revenue $ 10,936 $ 10,806 $ 33,110 $ 34,292
Revenue Recognized Over Time        
Disaggregation Of Revenue [Line Items]        
Net revenue 1,594   4,848  
Revenue Recognized at a Point in Time        
Disaggregation Of Revenue [Line Items]        
Net revenue $ 9,342   $ 28,262