Leases - Rental Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Leases [Abstract]
Rental equipment, primarily wireless recording equipment	$ 115,099		$ 107,645
Accumulated depreciation and impairment	(56,528)		(45,583)
Rental equipment, net	$ 58,571	$ 66,985	$ 62,062