SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 26, 2018 shares	Dec. 31, 2019 USD ($) system shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2019 USD ($) system tranche $ / shares shares	Dec. 31, 2018 USD ($) shares	Mar. 31, 2019 shares	Mar. 31, 2018 shares
Deferred Revenue Arrangement [Line Items]
Debt Instrument, Fair Value Disclosure		$ 13,100,000		$ 13,100,000
Number of Projection Systems Sold | system		24		136
Asset Impairment Charges		$ 0	$ 0	$ 0	$ 0
Activation fee revenue, per screen				2,000
Activation fee revenue range, minimum		1,000		1,000
Activation fee revenue range, maximum		2,000		2,000
Total stock-based compensation		178,000	$ 361,000	367,000	$ 763,000
Contract with Customer, Liability		3,000,000		3,000,000
Contract with Customer, Liability, Revenue Recognized		$ 1,300,000		3,400,000
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				4,066,172	5,043,341
Convertible Debt Securities [Member]
Deferred Revenue Arrangement [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares) | shares				9,999,999
Performance Shares [Member]
Deferred Revenue Arrangement [Line Items]
Issued | shares	1,941,402
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						1,361,309	1,390,584
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares						29,275
Stock Appreciation Rights (SARs) [Member]
Deferred Revenue Arrangement [Line Items]
Issued | shares		0	1,222,830	0	2,277,830
Total stock-based compensation		$ 111,000	$ 178,000	$ 332,000	$ 282,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares		1,462,610		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		$ 2,000		$ 4,000
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%		5.00%
Incentive fees, percentage of VPF Phase I		2.50%		2.50%
Up-front Payment Arrangement
Deferred Revenue Arrangement [Line Items]
Administrative fee VPFs		10.00%		10.00%
Prepaid Expense and Other Assets, Current [Member]
Deferred Revenue Arrangement [Line Items]
Asset Impairment Charges		$ 300,000	$ 300,000		$ 900,000
Product
Deferred Revenue Arrangement [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 200,000		$ 1,200,000