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Accrued Liabilities (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Components of accrued liabilities [Abstract] |  |  |
Accrued compensation and related charges | $ 2,066,000 | $ 1,807,000 |
Current portion of royalty payments | 800,000 | 1,375,000 |
Accrued income taxes | 640,000 | 306,000 |
Accrued professional services | 609,000 | 650,000 |
Accrued product warranty | 588,000 | 1,003,000 | 740,000
Loan commitment for related party notes receivable | 0 | 868,000 |
Other accrued liabilities | 2,499,000 | 1,588,000 |
Accrued liabilities, total | $ 7,202,000 | $ 7,597,000 |

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