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Accrued Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2017
Accrued Liabilities |
Components of accrued liabilities | The components of accrued liabilities are summarized below (in thousands):
|  | June 30, |  | December 31, |
|  | 2017 |  | 2016 |
Preferred stock dividends payable |  | $ | 2,901 |  | $ | 2,901 |
Accrued compensation and related charges |  |  | 1,955 |  |  | 2,610 |
Advance from customers |  |  | 1,286 |  |  | 238 |
Current portion of royalty payments |  |  | 575 |  |  | 575 |
Dividends payable by consolidated joint ventures |  |  | 512 |  |  | 499 |
Accrued professional services |  |  | 401 |  |  | 583 |
Accrued income taxes |  |  | 264 |  |  | 203 |
Accrued product warranty |  |  | 130 |  |  | 251 |
Other accrued liabilities |  |  | 1,339 |  |  | 1,400 |
|  | $ | 9,363 |  | $ | 9,260 |

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