Details of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 20,587	$ 21,270	$ 19,247	$ 14,644	$ 23,683	$ 14,195	$ 20,558	$ 15,285	$ 75,748	$ 73,721	$ 62,060
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									79,019	60,696	56,094
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									8,311	12,157	3,028
Colombia
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									300	558	556
Russian Federation
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									3,539	2,566	4,254
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									3,095	2,892	2,120
Eliminations
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									$ (18,516)	$ (5,148)	$ (3,992)