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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

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