NATURE OF OPERATIONS (Details)			1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 30, 2018 extension	Nov. 01, 2017 USD ($) director shares	Feb. 28, 2017 shares	Dec. 31, 2017 shares	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) segment theatre shares	Mar. 31, 2017 USD ($)	Dec. 29, 2017 USD ($) shares	Jul. 14, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items]
Sale of Stock, Number of Board Members to be Designated by Equity Buyer | director		2
Sale of Stock, Maximum Number of Board of Director Members | director		7
Number Of Movie Theatres | theatre						12,000
Number of reportable segments | segment						4
Net loss					$ (15,197,000)	$ (18,495,000)	$ (15,200,000)
Retained Earnings (Accumulated Deficit)					(360,415,000)	(379,225,000)	$ (360,415,000)
Change in restricted cash balances					7,983,000	0
Debt Conversion, Converted Instrument, Shares Issued | shares				3,536,783
Re-issuance of treasury stock in connection with convertible notes exchange transaction (in shares) | shares			277,244
Sale of Stock, Number of Shares Issued in Transaction | shares		333,333
Issuance of Class A common stock in exchange for the CEO's Second Lien Loans					$ 0	28,031,000
Digital Cinema Business
Finite-Lived Intangible Assets [Line Items]
Long-term Debt						40,200,000
Content and Entertainment and Corporate Segments
Finite-Lived Intangible Assets [Line Items]
Long-term Debt						$ 33,800,000
Convertible Debt [Member]
Finite-Lived Intangible Assets [Line Items]
Debt Conversion, Converted Instrument, Shares Issued | shares						3,536,783
Issuance of Class A common stock in exchange for the CEO's Second Lien Loans		$ 30,000,000
Extinguishment of Debt, Amount						$ 50,600,000
Repayments of Convertible Debt						$ 17,600,000
Convertible Debt [Member] | Class A common stock
Finite-Lived Intangible Assets [Line Items]
Sale of Stock, Number of Shares Issued in Transaction | shares		20,000,000
5.5% Senior Convertible Notes Due 2035 [Member] | Recourse Notes Payable [Member]
Finite-Lived Intangible Assets [Line Items]
Interest rate, stated percentage					5.50%	5.50%	5.50%
Second Lien Notes [Member]
Finite-Lived Intangible Assets [Line Items]
Debt amount, at issuance						$ 1,500,000
Bison Note Payable
Finite-Lived Intangible Assets [Line Items]
Debt amount, at issuance								$ 10,000,000.0
Interest rate, stated percentage								5.00%
Outstanding warrants | shares								1,400,000
Exchange Agreement [Member] | Convertible Debt [Member]
Finite-Lived Intangible Assets [Line Items]
Debt Instrument, Repurchased Face Amount					$ 13,400,000	$ 13,400,000	$ 13,400,000
Re-issuance of treasury stock in connection with convertible notes exchange transaction (in shares) | shares						277,244
Debt Conversion, Converted Instrument, Warrants or Options Issued | shares						200,000
Exchange Agreement [Member] | Convertible Debt [Member] | Class A common stock
Finite-Lived Intangible Assets [Line Items]
Debt Conversion, Converted Instrument, Shares Issued | shares						1,575,000
Exchange Agreement [Member] | Secured Debt [Member]
Finite-Lived Intangible Assets [Line Items]
Debt amount, at issuance						$ 3,500,000
Second Secured Lien Notes [Member]
Finite-Lived Intangible Assets [Line Items]
Interest rate, stated percentage									12.75%
Second Secured Lien Notes [Member] | Class A common stock
Finite-Lived Intangible Assets [Line Items]
Issuance of Class A common stock in exchange for the CEO's Second Lien Loans						500,000	$ 0
Second Secured Lien Notes [Member] | Secured Debt [Member]
Finite-Lived Intangible Assets [Line Items]
Debt amount, at issuance						10,500,000			$ 15,000,000
Interest rate, stated percentage									7.50%
Strategic Partner [Member] | Convertible Debt [Member] | Class A common stock
Finite-Lived Intangible Assets [Line Items]
Sale of Stock, Number of Shares Issued in Transaction | shares		19,666,667
Chief Executive Officer [Member] | Convertible Debt [Member] | Class A common stock
Finite-Lived Intangible Assets [Line Items]
Sale of Stock, Number of Shares Issued in Transaction | shares		333,333
Revolving Credit Facility
Finite-Lived Intangible Assets [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						40,211,000
Revolving Credit Facility | East West Loan Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 19,000,000
Debt Instrument, Number of One-Year Extensions | extension	2