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Total Net Revenue Based on Disaggregation Criteria (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation Of Revenue [Line Items]    
Total net revenue $ 18,120 $ 19,522
Point-in-Time    
Disaggregation Of Revenue [Line Items]    
Total net revenue 16,860 18,256
Over Time    
Disaggregation Of Revenue [Line Items]    
Total net revenue 1,260 1,266
Americas    
Disaggregation Of Revenue [Line Items]    
Total net revenue 13,868 14,725
Americas | Point-in-Time    
Disaggregation Of Revenue [Line Items]    
Total net revenue 12,705 13,524
Americas | Over Time    
Disaggregation Of Revenue [Line Items]    
Total net revenue 1,163 1,201
Europe and the Middle East    
Disaggregation Of Revenue [Line Items]    
Total net revenue 2,601 2,930
Europe and the Middle East | Point-in-Time    
Disaggregation Of Revenue [Line Items]    
Total net revenue 2,504 2,865
Europe and the Middle East | Over Time    
Disaggregation Of Revenue [Line Items]    
Total net revenue 97 65
Asia-Pacific    
Disaggregation Of Revenue [Line Items]    
Total net revenue 1,651 1,867
Asia-Pacific | Point-in-Time    
Disaggregation Of Revenue [Line Items]    
Total net revenue $ 1,651 $ 1,867