SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details)		3 Months Ended		12 Months Ended
	Jul. 26, 2018 shares	Jun. 30, 2019 USD ($) system tranche $ / shares shares	Jun. 30, 2018 USD ($) shares	Mar. 31, 2019 shares	Mar. 31, 2018 shares
Deferred Revenue Arrangement [Line Items]
Debt Instrument, Fair Value Disclosure		$ 18,800,000
Number of Projection Systems Sold | system		35
Asset Impairment Charges		$ 0	$ 0
Activation fee revenue, per screen		2,000
Activation fee revenue range, minimum		1,000
Activation fee revenue range, maximum		2,000
Total stock-based compensation		11,000	86,000
Contract with Customer, Liability		3,600,000
Contract with Customer, Liability, Revenue Recognized		800,000	$ (1,400,000)
Share-based Compensation Expense, Adjustment		$ 166,000
Stock Options and Warrants [Member]
Deferred Revenue Arrangement [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares) | shares		4,155,921	3,592,074
Convertible Debt Securities [Member]
Deferred Revenue Arrangement [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares) | shares		3,333,333
Performance Shares [Member]
Deferred Revenue Arrangement [Line Items]
Issued | shares	1,941,402			0
Share-based Compensation Arrangement by Share-based Payment Awards, Number of Tranches | tranche		2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares		$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares				1,370,811	1,390,584
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares				19,773
Stock Appreciation Rights (SARs) [Member]
Deferred Revenue Arrangement [Line Items]
Issued | shares		0	2,277,830
Total stock-based compensation		$ 110,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares		1,462,610		1,462,610
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares		0		815,220
Restricted Stock [Member]
Deferred Revenue Arrangement [Line Items]
Total stock-based compensation		$ 1,000
Minimum
Deferred Revenue Arrangement [Line Items]
Revenue from Contract with Customer, Payment Term		30 days
Maximum
Deferred Revenue Arrangement [Line Items]
Revenue from Contract with Customer, Payment Term		90 days
Services
Deferred Revenue Arrangement [Line Items]
Administrative fee VPFs		5.00%
Incentive fees, percentage of VPF Phase I		2.50%
Up-front Payment Arrangement
Deferred Revenue Arrangement [Line Items]
Administrative fee VPFs		10.00%
Prepaid Expense and Other Assets, Current [Member]
Deferred Revenue Arrangement [Line Items]
Asset Impairment Charges		$ 200,000	$ 300,000
Product
Deferred Revenue Arrangement [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 400,000