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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%

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