Supporting Financial Information - Other Expense (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
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interest expense									$ (883)	$ (454)
Amortization of deferred financing costs as interest expense									(268)	(289)
Change in fair value of derivative financial instruments									(102)	(27)
Other income (expense), net									25	(53)
Interest expense, net	$ (340)	$ (269)	$ (255)	$ (364)	$ (542)	$ (374)	$ (127)	$ (575)	$ (1,228)	$ (823)