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Geographic Regions (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 54,677 | $ 47,760 | $ 32,944 | $ 29,135 | $ 42,409 | $ 33,342 | $ 22,483 | $ 22,074 | $ 164,516 | $ 120,308 | $ 104,883
Operating income (loss) |  |  |  |  |  |  |  |  | 10,425 | (7,908) | (13,521)
Net long-lived assets | 15,792 |  |  |  | 15,960 |  |  |  | 15,792 | 15,960 |
The Netherlands |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 81,443 | 52,189 | 46,982
Operating income (loss) |  |  |  |  |  |  |  |  | 5,206 | (7,773) | (9,069)
Net long-lived assets | 5,190 |  |  |  | 4,996 |  |  |  | 5,190 | 4,996 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 60,952 | 44,299 | 37,483
Operating income (loss) |  |  |  |  |  |  |  |  | 1,527 | (1,396) | (5,541)
Net long-lived assets | 9,924 |  |  |  | 10,171 |  |  |  | 9,924 | 10,171 |
France |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 5,588 | 8,758 | 8,387
Operating income (loss) |  |  |  |  |  |  |  |  | (1,000) | (783) | (330)
Net long-lived assets | 289 |  |  |  | 241 |  |  |  | 289 | 241 |
China |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 12,673 | 11,799 | 9,725
Operating income (loss) |  |  |  |  |  |  |  |  | 3,647 | 1,530 | 986
Net long-lived assets | $ 389 |  |  |  | $ 552 |  |  |  | 389 | 552 |
Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 3,860 | 3,263 | 2,306
Operating income (loss) |  |  |  |  |  |  |  |  | $ 1,045 | $ 514 | $ 433

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