Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Concentrations - Summary of Net Revenue from Various Products (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Concentration Risk [Line Items]        
Net revenue $ 8,646 $ 10,936 $ 27,617 $ 33,110
Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Percentage of sales 100.00% 100.00% 100.00% 100.00%
Laser systems        
Concentration Risk [Line Items]        
Net revenue $ 5,167 $ 7,055 $ 16,047 $ 20,678
Laser systems | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Percentage of sales 59.80% 64.50% 58.10% 62.50%
Imaging systems        
Concentration Risk [Line Items]        
Net revenue $ 4 $ 382 $ 619 $ 1,336
Imaging systems | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Percentage of sales   3.50% 2.20% 4.00%
Consumables and other        
Concentration Risk [Line Items]        
Net revenue $ 1,478 $ 1,902 $ 5,678 $ 6,239
Consumables and other | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Percentage of sales 17.10% 17.40% 20.60% 18.90%
Services        
Concentration Risk [Line Items]        
Net revenue $ 1,994 $ 1,594 $ 5,264 $ 4,848
Services | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Percentage of sales 23.10% 14.60% 19.10% 14.60%
License fees and royalties        
Concentration Risk [Line Items]        
Net revenue $ 3 $ 3 $ 9 $ 9