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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 |  |  |

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