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Information About Geographic Areas (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
segment
Sep. 30, 2019
USD ($)
Product Information [Line Items]        
Number of reporting segment | segment     1  
Sales to customers $ 39,861 $ 26,496 $ 93,536 $ 84,803
Geographic Concentration Risk | United States | Revenue from Contract with Customer        
Product Information [Line Items]        
Sales to customers $ 23,300 $ 10,500 $ 50,700 $ 32,900
Concentration risk, percentage 58.00% 40.00% 54.00% 39.00%
Geographic Concentration Risk | China | Revenue from Contract with Customer        
Product Information [Line Items]        
Sales to customers   $ 3,900   $ 11,400
Concentration risk, percentage   15.00%   13.00%