FIXED ASSETS - Fixed Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 7,577	$ 5,201
Less accumulated depreciation and amortization	(3,039)	(2,530)
Fixed assets, net	4,538	2,671
Equipment and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	1,834	2,299
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 507	439
Estimated Useful Lives	5 years
Construction in process
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 2,142	271
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	1,845	1,453
Capital leases (primarily composed of computer equipment)
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 1,249	$ 739
Minimum | Equipment and software
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Minimum | Capital leases (primarily composed of computer equipment)
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Maximum | Equipment and software
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	7 years
Maximum | Capital leases (primarily composed of computer equipment)
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	7 years