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CONSOLIDATED BALANCE SHEET COMPONENTS - PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 331,617 $ 342,829
Less: accumulated depreciation and amortization (323,650) (328,782)
Total property and equipment, net 7,967 14,047
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 183 231
Computer Equipment and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,051 1,096
Software Development Costs [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,950 3,034
Internal use Software in Process [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,212 1,361
Digital Cinema Projection Systems [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 324,760 336,471
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 437 490
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 24 $ 146