Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Concentration Risk [Line Items]      
Net revenue $ 46,155 $ 46,926 $ 51,810
Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Concentration Risk Percentage 100.00% 100.00% 100.00%
Laser systems      
Concentration Risk [Line Items]      
Net revenue $ 29,733 $ 29,121 $ 35,150
Laser systems | Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Concentration Risk Percentage 64.40% 62.00% 67.90%
Imaging systems      
Concentration Risk [Line Items]      
Net revenue $ 1,694 $ 3,685 $ 3,066
Imaging systems | Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Concentration Risk Percentage 3.70% 7.90% 5.90%
Consumables and other      
Concentration Risk [Line Items]      
Net revenue $ 8,287 $ 7,332 $ 6,906
Consumables and other | Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Concentration Risk Percentage 18.00% 15.60% 13.30%
Services      
Concentration Risk [Line Items]      
Net revenue $ 6,429 $ 6,660 $ 6,539
Services | Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Concentration Risk Percentage 13.90% 14.20% 12.60%
License fees and royalties      
Concentration Risk [Line Items]      
Net revenue $ 12 $ 128 $ 149
License fees and royalties | Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Concentration Risk Percentage   0.30% 0.30%