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Balance Sheet Detail (in thousands) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Inventories |  |
Finished products | $ 5 | $ 5
Accrued Expenses |  |
Accrued payroll | 76 | 59
Accrued vacation | 271 | 222
Accrued warranty expense | 3 | 3
Accrued interest | 130 | 54
Deferred rent |  | 43
Other | 68 | 80
Total Accrued expenses | $ 548 | $ 461

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