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Geographic, Customer and Supplier Information - Sales Details of Customers Locations in Four Geographic Regions (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) segment
Geographic, Customer and Supplier Information |  |  |  |  |  |  |  |  |  |  |
Number of geographic regions | segment |  |  |  |  |  |  |  |  | 3 |  |
Total revenue | $ 64,799 | $ 52,495 | $ 49,554 | $ 45,432 | $ 54,506 | $ 51,126 | $ 45,694 | $ 41,965 | $ 212,280 | $ 193,291 | $ 192,304
Gross profit | 42,246 | $ 34,543 | $ 35,981 | $ 34,697 | 35,908 | $ 36,646 | $ 32,048 | $ 29,912 | 147,467 | 134,514 | 130,657
Long-lived assets | 12,067 |  |  |  | 9,401 |  |  |  | 12,067 | $ 9,401 | $ 7,721
As Previously Reported |  |  |  |  |  |  |  |  |  |  |
Geographic, Customer and Supplier Information |  |  |  |  |  |  |  |  |  |  |
Number of geographic regions | segment |  |  |  |  |  |  |  |  |  | 4 | 4
Operating Segments | Europe, Middle East, Africa (EMEA) |  |  |  |  |  |  |  |  |  |  |
Geographic, Customer and Supplier Information |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 103,293 | $ 92,859 | $ 95,897
Gross profit |  |  |  |  |  |  |  |  | 71,840 | 61,506 | 67,008
Long-lived assets | 7,665 |  |  |  | 8,437 |  |  |  | 7,665 | 8,437 | 7,013
Operating Segments | Americas |  |  |  |  |  |  |  |  |  |  |
Geographic, Customer and Supplier Information |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 54,979 | 52,981 | 33,204
Gross profit |  |  |  |  |  |  |  |  | 38,204 | 41,491 | 21,519
Long-lived assets | 4,247 |  |  |  | 897 |  |  |  | 4,247 | 897 | 634
Operating Segments | Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Geographic, Customer and Supplier Information |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 54,008 | 47,451 | 63,203
Gross profit |  |  |  |  |  |  |  |  | 37,423 | 31,517 | 42,130
Long-lived assets | $ 155 |  |  |  | $ 68 |  |  |  | $ 155 | $ 68 | $ 74

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