Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Concentrations - Summary of Net Revenue from Various Products (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Concentration Risk [Line Items]    
Net revenue $ 10,020 $ 10,874
Product Concentration Risk | Sales Revenue, Net    
Concentration Risk [Line Items]    
Concentration Risk Percentage 100.00% 100.00%
Laser systems    
Concentration Risk [Line Items]    
Net revenue $ 5,703 $ 6,729
Laser systems | Product Concentration Risk | Sales Revenue, Net    
Concentration Risk [Line Items]    
Concentration Risk Percentage 57.00% 61.90%
Imaging systems    
Concentration Risk [Line Items]    
Net revenue $ 583 $ 626
Imaging systems | Product Concentration Risk | Sales Revenue, Net    
Concentration Risk [Line Items]    
Concentration Risk Percentage 5.80% 5.70%
Consumables and other    
Concentration Risk [Line Items]    
Net revenue $ 2,034 $ 1,692
Consumables and other | Product Concentration Risk | Sales Revenue, Net    
Concentration Risk [Line Items]    
Concentration Risk Percentage 20.30% 15.60%
Services    
Concentration Risk [Line Items]    
Net revenue $ 1,697 $ 1,795
Services | Product Concentration Risk | Sales Revenue, Net    
Concentration Risk [Line Items]    
Concentration Risk Percentage 16.90% 16.50%
License fees and royalties    
Concentration Risk [Line Items]    
Net revenue $ 3 $ 32
License fees and royalties | Product Concentration Risk | Sales Revenue, Net    
Concentration Risk [Line Items]    
Concentration Risk Percentage 0.00% 0.30%