SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details) - USD ($)	3 Months Ended			12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2015	Mar. 31, 2018	Mar. 31, 2017
Deferred Revenue Arrangement [Line Items]
Provision for doubtful accounts	$ (589,000)	$ 1,213,000		$ 991,000	$ 1,213,000
Loss on write-off of property and equipment		$ 0		64,000
Goodwill, Impairment Loss	0
Activation Fee Revenue, Per Screen			$ 2,000
Activation fee revenue, lower range			1,000
Activation fee revenue, upper range			$ 2,000
Advertising costs				$ 0	$ 100,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				2,890,824	1,416,677
Up-front Payment Arrangement [Member]
Deferred Revenue Arrangement [Line Items]
Administrative Fee VPFs			10.00%
Services
Deferred Revenue Arrangement [Line Items]
Provision for doubtful accounts	0			$ 0	$ 0
Goodwill, Impairment Loss	$ 0
Administrative Fee VPFs	5.00%			5.00%
Incentive Fees, Percentage of VPF Phase I			2.50%
Content & Entertainment
Deferred Revenue Arrangement [Line Items]
Provision for doubtful accounts	$ 3,000			$ 0	$ 267,000
Goodwill, Impairment Loss	$ 0
Class A common stock | Forward Contracts [Member]
Deferred Revenue Arrangement [Line Items]
Forward Contracts Indexed to Issuer's Equity, Indexed Shares	1,179,138	1,179,138		1,179,138	1,179,138
Prepaid Expense and Other Assets, Current [Member]
Deferred Revenue Arrangement [Line Items]
Loss on write-off of property and equipment					$ 3,600,000
Management [Member] | Restricted Stock [Member]
Deferred Revenue Arrangement [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				0	1,055,465
Director [Member] | Restricted Stock [Member]
Deferred Revenue Arrangement [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				174,942	129,066