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Consolidated Balance Sheets and Statements of Operations and Comprehensive Income (Loss) Components (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Prepaid expenses and other current assets:    
Inventory $ 252,000  
Interest receivable 263,000 127,000
Tax receivable 57,000 157,000
Deferred cost of revenue   101,000
Prepaid expenses and other assets 790,000 1,211,000
Total 1,362,000 1,596,000
Property and equipment:    
Property and equipment, gross 4,786,000 4,622,000
Less: Accumulated depreciation and amortization (3,548,000) (3,240,000)
Property and equipment, net 1,238,000 1,382,000
Equipment, furniture and fixtures and leasehold improvements
    
Property and equipment:    
Property and equipment, gross 4,135,000 3,996,000
Acquired software
    
Property and equipment:    
Property and equipment, gross 651,000 626,000
Testing equipment purchased through capital leases
    
Property and equipment:    
Property and equipment, gross 198,000  
Less: Accumulated depreciation and amortization $ 198,000 $ 298,000