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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, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) segment
Geographic, Customer and Supplier Information |  |  |  |  |  |  |  |  |  |  |
Number of geographic regions | segment |  |  |  |  |  |  |  |  | 3 |  |
Revenue | $ 54,506 | $ 51,126 | $ 45,694 | $ 41,965 | $ 47,597 | $ 43,648 | $ 54,293 | $ 46,767 | $ 193,291 | $ 192,304 | $ 241,443
Gross profit | 35,908 | $ 36,646 | $ 32,048 | $ 29,912 | 31,954 | $ 30,050 | $ 36,551 | $ 32,104 | 134,514 | 130,657 | 143,540
Long-lived assets | 9,401 |  |  |  | 7,721 |  |  |  | 9,401 | $ 7,721 | $ 3,461
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 |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 92,859 | $ 95,897 | $ 164,180
Gross profit |  |  |  |  |  |  |  |  | 61,506 | 67,008 | 92,916
Long-lived assets | 8,437 |  |  |  | 7,013 |  |  |  | 8,437 | 7,013 | 2,778
Operating Segments | Americas |  |  |  |  |  |  |  |  |  |  |
Geographic, Customer and Supplier Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 52,981 | 33,204 | 25,596
Gross profit |  |  |  |  |  |  |  |  | 41,491 | 21,519 | 18,416
Long-lived assets | 897 |  |  |  | 634 |  |  |  | 897 | 634 | 620
Operating Segments | Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Geographic, Customer and Supplier Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 47,451 | 63,203 | 51,667
Gross profit |  |  |  |  |  |  |  |  | 31,517 | 42,130 | 32,207
Long-lived assets | $ 68 |  |  |  | $ 74 |  |  |  | $ 68 | $ 74 | $ 63

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