Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation Of Revenue [Line Items]      
Net revenue $ 46,155 $ 46,926 $ 51,810
Revenue Recognized Over Time      
Disaggregation Of Revenue [Line Items]      
Net revenue 6,441 7,123 7,103
Revenue Recognized at a Point in Time      
Disaggregation Of Revenue [Line Items]      
Net revenue $ 39,714 $ 39,803 $ 44,707