Europe, Middle East, Africa | Americas | Asia | Total | |||||||||
(in thousands) | ||||||||||||
Year ended December 31, 2015 | ||||||||||||
Total revenue | ||||||||||||
Sales to external customers | $ | 3,635 | $ | 3,954 | $ | 24,943 | $ | 32,532 | ||||
Year ended December 31, 2016 | ||||||||||||
Total revenue | ||||||||||||
Sales to external customers | $ | 5,593 | $ | 6,669 | $ | 33,317 | $ | 45,579 | ||||
Year ended December 31, 2017 | ||||||||||||
Total revenue | ||||||||||||
Sales to external customers | $ | 5,641 | $ | 10,045 | $ | 32,577 | $ | 48,263 |