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Consolidated Balance Sheets and Statements of Operations and Comprehensive Income (Loss) Components (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Prepaid expenses and other current assets: |  |
Inventory | $ 567,000 | $ 252,000
Interest receivable | 382,000 | 263,000
Prepaid expenses and other assets | 722,000 | 847,000
Total | 1,671,000 | 1,362,000
Property and equipment: |  |
Property and equipment, gross | 4,609,000 | 4,786,000
Less: Accumulated depreciation and amortization | (3,903,000) | (3,548,000)
Property and equipment, net | 706,000 | 1,238,000
Equipment, furniture and fixtures and leasehold improvements |  |
Property and equipment: |  |
Property and equipment, gross | 3,923,000 | 4,135,000
Acquired software |  |
Property and equipment: |  |
Property and equipment, gross | 686,000 | 651,000
Testing equipment purchased through capital leases |  |
Property and equipment: |  |
Property and equipment, gross | $ 198,000 |

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