Geographic Regions (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue	$ 28,198	$ 40,016	$ 24,273	$ 12,396	$ 19,822	$ 9,190	$ 12,717	$ 14,772	$ 104,883	$ 56,501	$ 34,798
Operating income (loss)									(13,521)	(13,089)	(19,994)
Net long-lived assets	17,761				9,752				17,761	9,752
The Netherlands
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue									46,982	31,779	17,615
Operating income (loss)									(9,069)	(9,403)	(11,139)
Net long-lived assets	6,677				7,617				6,677	7,617
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue									37,483	20,433	11,855
Operating income (loss)									(5,541)	(207)	(4,346)
Net long-lived assets	10,162				1,016				10,162	1,016
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue									8,387	4,218	5,328
Operating income (loss)									(330)	(611)	(815)
Net long-lived assets	346				475				346	475
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue									9,725	71	0
Operating income (loss)									986	(2,868)	(3,694)
Net long-lived assets	$ 576				$ 644				576	644
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenue									2,306	0	0
Operating income (loss)									$ 433	$ 0	$ 0