CONSOLIDATED BALANCE SHEET COMPONENTS - PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 365,464	$ 366,817
Less: accumulated depreciation and amortization	(343,981)	(333,679)
Total property and equipment, net	21,483	33,138
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	268	816
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,859	4,374
Digital Cinema Projection Systems [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	360,633	360,651
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	553	592
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 151	$ 384