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PROPERTY AND EQUIPMENT (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Property and equipment, cost $ 7,189,000 $ 8,525,000
Accumulated depreciation 6,921,000 8,224,000
Property and equipment, net 268,000 301,000
Reduction in accumulated depreciation due to fully deprecated equipment no longer in service 0 1,422,000
Demonstration and rental equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, cost 688,000 2,107,000
Accumulated depreciation 671,000 2,068,000
Research and development equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, cost 3,760,000 3,712,000
Accumulated depreciation 3,694,000 3,660,000
Manufacturing equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, cost 1,190,000 1,185,000
Accumulated depreciation 1,171,000 1,155,000
Office furniture and equipment [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, cost 1,117,000 1,091,000
Accumulated depreciation 1,021,000 999,000
Leasehold improvements [Member]
    
Property, Plant and Equipment [Line Items]    
Property and equipment, cost 434,000 430,000
Accumulated depreciation $ 364,000 $ 342,000