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Disaggregation of Revenue (Tables)
6 Months Ended
Jun. 30, 2020
Revenue by Geography [Abstract]  
Schedule of Disaggregation Of Revenue [Table Text Block] The geographic information in the table below is presented for the three and six months ended June 30, 2020 and 2019. 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 June 30,Six Months Ended June 30,
 2020201920202019
(in thousands)RevenuePercentRevenuePercentRevenuePercentRevenuePercent
United States of America$20,715  32 %$20,862  33 %$42,515  33 %$40,642  34 %
Europe17,682  28 %18,720  29 %37,612  29 %36,007  30 %
The rest of the world25,350  40 %24,296  38 %49,931  38 %43,360  36 %
      Total revenue$63,747  100 %$63,878  100 %$130,058  100 %$120,009  100 %