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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation Of Revenue [Line Items]        
Net revenue $ 12,154 $ 12,612 $ 22,174 $ 23,486
Revenue Recognized Over Time        
Disaggregation Of Revenue [Line Items]        
Net revenue 1,557   3,254  
Revenue Recognized at a Point in Time        
Disaggregation Of Revenue [Line Items]        
Net revenue $ 10,597   $ 18,920