Summarized Data for Each of the Quarters (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 16,314	$ 17,678	$ 14,931	$ 13,137	$ 16,008	$ 19,751	$ 27,942	$ 21,166	$ 62,060	$ 84,867	$ 236,912
Gross profit (loss)	(5,467)	(2,900)	(4,594)	(6,402)	(9,289)	(3,306)	1,416	(21)	(19,363)	(11,200)	96,459
Income (loss) from operations	(14,816)	(12,015)	(13,987)	(14,692)	(21,667)	(12,451)	(8,549)	(9,888)	(55,510)	(52,555)	53,799
Other income (expense), net	2	(617)	719	73	1,180	(489)	584	1,446	177	2,721	(256)
Net income (loss)	$ (12,309)	$ (11,654)	$ (10,965)	$ (11,042)	$ (13,450)	$ (8,564)	$ (5,182)	$ (5,445)	$ (45,970)	$ (32,641)	$ 36,911
Basic loss per share	$ (0.94)	$ (0.89)	$ (0.84)	$ (0.85)	$ (1.03)	$ (0.66)	$ (0.40)	$ (0.41)	$ (3.52)	$ (2.51)	$ 2.82
Diluted loss per share	$ (0.94)	$ (0.89)	$ (0.84)	$ (0.85)	$ (1.03)	$ (0.66)	$ (0.40)	$ (0.41)	$ (3.52)	$ (2.51)	$ 2.81