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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Concentration Risk [Line Items]        
Net revenue $ 12,154 $ 12,612 $ 22,174 $ 23,486
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 $ 7,920 $ 7,961 $ 13,623 $ 14,690
Laser systems | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 65.20% 63.10% 61.40% 62.60%
Imaging systems        
Concentration Risk [Line Items]        
Net revenue $ 371 $ 954 $ 954 $ 1,580
Imaging systems | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 3.10% 7.50% 4.30% 6.70%
Consumables and other        
Concentration Risk [Line Items]        
Net revenue $ 2,303 $ 2,051 $ 4,337 $ 3,743
Consumables and other | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 18.90% 16.30% 19.60% 15.90%
Services        
Concentration Risk [Line Items]        
Net revenue $ 1,557 $ 1,614 $ 3,254 $ 3,409
Services | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Concentration Risk Percentage 12.80% 12.80% 14.70% 14.50%
License fees and royalties        
Concentration Risk [Line Items]        
Net revenue $ 3 $ 32 $ 6 $ 64
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%