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BUSINESS COMBINATIONS - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	May 23, 2018	Oct. 16, 2017	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Apr. 30, 2018
Business Acquisition [Line Items]
Acquisition, net of cash acquired				$ 29,744	$ 0	$ 0
Acquisition-related contingent consideration				3,051	354
Additional expense recognized in acquisition-related costs and expenses				1,750	0	0
Payment for contingent consideration liability				1,284	$ 0	$ 0
Revenue from business combinations				9,100
Net loss from business combinations				5,300
A2iA
Business Acquisition [Line Items]
Acquisition, net of cash acquired	$ 26,800
Acquisition-related shares issued (in shares)	2,514,588
Common stock issued during acquisition, value	$ 21,900
Transaction-related liabilities	200
Expenses incurred in connection with acquisition	2,100
Payments for cash for collateral	$ 700
Payments for collateral, equity (in shares)	508,479
Payments for collateral, equity, value	$ 4,400
Period to maintain escrow funds	24 months
ICAR
Business Acquisition [Line Items]
Acquisition, net of cash acquired		$ 3,000
Acquisition-related shares issued (in shares)		584,291
Common stock issued during acquisition, value		$ 5,600
Expenses incurred in connection with acquisition		$ 500
Period to maintain escrow funds		24 months
Acquisition-related contingent consideration		$ 2,900
Additional expense recognized in acquisition-related costs and expenses				$ 1,800
Escrow deposit		1,500					$ 1,500
ICAR | Contingent Consideration, Fourth Quarter Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high		1,500
ICAR | Contingent Consideration, Earnout Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high		3,800
ICAR | Contingent Consideration, Earnout Consideration | Subsequent Event | Scenario, Forecast
Business Acquisition [Line Items]
Payment for contingent consideration liability			$ 1,800
ICAR | Maximum
Business Acquisition [Line Items]
Total consideration paid		$ 13,900

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