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Accrued Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2014
Accrued Liabilities [Abstract] |
Components of accrued liabilities | The components of accrued liabilities are summarized below (in thousands):
|  | June 30, |  |  | December 31, |
|  | 2014 |  |  | 2013 |
Accrued compensation and related charges |  | $ | 1,638 |  |  | $ | 1,762 |
Accrued product warranty |  |  | 980 |  |  |  | 1,048 |
Current portion of royalty payments |  |  | 800 |  |  |  | 800 |
Dividends payable by consolidated joint ventures |  |  | 647 |  |  |  | 649 |
Accrued professional services |  |  | 415 |  |  |  | 543 |
Accrued income taxes |  |  | 206 |  |  |  | 125 |
Other accrued liabilities |  |  | 2,436 |  |  |  | 2,359 |
|  | $ | 7,122 |  |  | $ | 7,286

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