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Disaggregation of Revenue (Notes) | 9 Months Ended
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Sep. 30, 2021
Disaggregation of Revenue [Abstract] |
Disaggregation of Revenue [Text Block] | Disaggregation of Revenue Revenue by Geography The geographic information in the table below is presented for the three and nine months ended September 30, 2021 and 2020. The Company categorizes geographic revenues based on the location of the customer's headquarters. Because the Company's contracts are predominately denominated in U.S. dollars, it has limited exposure to foreign currency exchange risk as discussed under "Foreign Currency Exchange Risk" of Part I, Item 3 below.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
(in thousands) | Revenue |  | Percent |  | Revenue |  | Percent |  | Revenue |  | Percent |  | Revenue |  | Percent
United States of America | $ | 23,275 |  |  | 37 | % |  | $ | 19,960 |  |  | 32 | % |  | $ | 66,026 |  |  | 35 | % |  | $ | 62,475 |  |  | 33 | %
Europe | 18,571 |  |  | 30 | % |  | 18,827 |  |  | 31 | % |  | 55,825 |  |  | 30 | % |  | 56,439 |  |  | 29 | %
The rest of the world | 20,825 |  |  | 33 | % |  | 22,721 |  |  | 37 | % |  | 64,599 |  |  | 35 | % |  | 72,652 |  |  | 38 | %
Total revenue | $ | 62,671 |  |  | 100 | % |  | $ | 61,508 |  |  | 100 | % |  | $ | 186,450 |  |  | 100 | % |  | $ | 191,566 |  |  | 100 | %

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