Quarterly report pursuant to Section 13 or 15(d)

Concentrations - Summary of Net Revenue from Various Products (Detail)

v3.10.0.1
Concentrations - Summary of Net Revenue from Various Products (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Concentration Risk [Line Items]        
Net revenue $ 10,936 $ 10,806 $ 33,110 $ 34,292
Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 100.00% 100.00% 100.00% 100.00%
Laser systems        
Concentration Risk [Line Items]        
Net revenue $ 7,055 $ 6,335 $ 20,678 $ 21,026
Laser systems | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 64.50% 58.60% 62.50% 61.30%
Imaging systems        
Concentration Risk [Line Items]        
Net revenue $ 382 $ 1,103 $ 1,336 $ 2,683
Imaging systems | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 3.50% 10.20% 4.00% 7.80%
Consumables and other        
Concentration Risk [Line Items]        
Net revenue $ 1,902 $ 1,751 $ 6,239 $ 5,494
Consumables and other | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 17.40% 16.20% 18.90% 16.00%
Services        
Concentration Risk [Line Items]        
Net revenue $ 1,594 $ 1,585 $ 4,848 $ 4,993
Services | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 14.60% 14.70% 14.60% 14.60%
License fees and royalties        
Concentration Risk [Line Items]        
Net revenue $ 3 $ 32 $ 9 $ 96
License fees and royalties | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 0.00% 0.30% 0.00% 0.30%