Rental Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Rental Equipment [Abstract]
Rental equipment, primarily wireless recording equipment	$ 76,245	$ 55,734
Accumulated depreciation and impairment	(36,700)	(39,272)
Rental equipment, net	$ 39,545	$ 16,462