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Accrued liabilities components (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Accrued Liabilities Components Details |  |
Bonuses | $ 724,000 | $ 1,214,000
Payroll and payroll taxes | 427,000 | 590,000
Compensated absences | 384,000 | 508,000
Deferred rent credit | 187,000 | 261,000
Warranty | 206,000 | 490,000
Adverse purchase commitments | 634,000 | 134,000
Accelerated rent expense | 109,000 | 402,000
Professional fees | 533,000 | 415,000
Purchased patents | 0 | 330,000
Other | 803,000 | 769,000
Accrued liabilities | $ 4,007,000 | $ 5,113,000

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