Annual report pursuant to Section 13 and 15(d)

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

v3.21.1
Concentrations - Summary of Net Revenue from Various Products (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Concentration Risk [Line Items]      
Net revenue $ 22,780 $ 37,799 $ 46,155
Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Percentage of sales 100.00% 100.00% 100.00%
Laser systems      
Concentration Risk [Line Items]      
Net revenue $ 12,342 $ 22,842 $ 29,733
Laser systems | Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Percentage of sales 54.20% 60.40% 64.40%
Imaging systems      
Concentration Risk [Line Items]      
Net revenue   $ 619 $ 1,694
Imaging systems | Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Percentage of sales   1.60% 3.70%
Consumables and other      
Concentration Risk [Line Items]      
Net revenue $ 6,124 $ 7,164 $ 8,287
Consumables and other | Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Percentage of sales 26.90% 19.00% 18.00%
Services      
Concentration Risk [Line Items]      
Net revenue $ 4,314 $ 7,162 $ 6,429
Services | Product Concentration Risk | Sales Revenue, Net      
Concentration Risk [Line Items]      
Percentage of sales 18.90% 19.00% 13.90%
License fees and royalties      
Concentration Risk [Line Items]      
Net revenue   $ 12 $ 12