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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation Of Revenue [Line Items]        
Net revenue $ 2,938 $ 8,645 $ 7,721 $ 18,971
Revenue Recognized Over Time        
Disaggregation Of Revenue [Line Items]        
Net revenue 985 1,646 2,006 3,415
Revenue Recognized at a Point in Time        
Disaggregation Of Revenue [Line Items]        
Net revenue $ 1,953 $ 6,999 $ 5,715 $ 15,556