ACQUISITION OF CANTALOUPE SYSTEMS, INC. - Additional Information (Details) - USD ($)		3 Months Ended				6 Months Ended		12 Months Ended
	Nov. 09, 2017	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Business Acquisition [Line Items]
Principal amount	$ 35,000,000.0
Goodwill		$ 64,149,000		$ 64,403,000		$ 64,149,000	$ 64,403,000	$ 64,149,000
Revenues		34,406,000		31,532,000		67,928,000	56,791,000
Net income (loss)		(10,657,000)	$ (6,320,000)	(4,194,000)	$ (2,171,000)	(16,977,000)	(6,365,000)
(Provision) benefit for income taxes		$ (19,000)		157,000		$ (37,000)	129,000
Excluded from unaudited pro forma earnings
Business Acquisition [Line Items]
Integration and acquisition costs				$ 3,300,000			4,100,000
Customer relationships | Minimum
Business Acquisition [Line Items]
Useful life						10 years		10 years
Customer relationships | Maximum
Business Acquisition [Line Items]
Useful life						18 years		18 years
Developed technology | Minimum
Business Acquisition [Line Items]
Useful life						5 years		5 years
Developed technology | Maximum
Business Acquisition [Line Items]
Useful life						6 years		6 years
Term Loan
Business Acquisition [Line Items]
Principal amount	25,000,000.0
Revolving Credit Facility
Business Acquisition [Line Items]
Principal amount	10,000,000.0
Cantaloupe
Business Acquisition [Line Items]
Total consideration (As Restated)	88,207,000
Intangibles	$ 30,800,000
Weighted average useful life	13 years
Goodwill	$ 52,658,000
Net income (loss)							1,500,000
Cantaloupe | Revenue
Business Acquisition [Line Items]
Revenues							$ 4,700,000
Cantaloupe | Minimum
Business Acquisition [Line Items]
Useful life	6 years
Cantaloupe | Maximum
Business Acquisition [Line Items]
Useful life	18 years
Cantaloupe | Customer relationships
Business Acquisition [Line Items]
Intangibles	$ 18,900,000
Cantaloupe | Developed technology
Business Acquisition [Line Items]
Intangibles	10,300,000
Cantaloupe | Trade name
Business Acquisition [Line Items]
Intangibles	$ 1,600,000