Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Concentrations - Summary of Net Revenue from Various Products (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Concentration Risk [Line Items]        
Net revenue $ 8,645 $ 12,154 $ 18,971 $ 22,174
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 $ 4,917 $ 7,920 $ 10,880 $ 13,623
Laser systems | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Percentage of sales 56.90% 65.20% 57.40% 61.40%
Imaging systems        
Concentration Risk [Line Items]        
Net revenue $ 63 $ 371 $ 615 $ 954
Imaging systems | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Percentage of sales 0.70% 3.10% 3.20% 4.30%
Consumables and other        
Concentration Risk [Line Items]        
Net revenue $ 2,084 $ 2,303 $ 4,196 $ 4,337
Consumables and other | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Percentage of sales 24.10% 18.90% 22.10% 19.60%
Services        
Concentration Risk [Line Items]        
Net revenue $ 1,578 $ 1,557 $ 3,273 $ 3,254
Services | Product Concentration Risk | Sales Revenue, Net        
Concentration Risk [Line Items]        
Percentage of sales 18.30% 12.80% 17.30% 14.70%
License fees and royalties        
Concentration Risk [Line Items]        
Net revenue $ 3 $ 3 $ 7 $ 6