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Accrued Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2018
Accrued Liabilities |
Components of accrued liabilities | The components of accrued liabilities are summarized below (in thousands):
|  | March 31, |  | December 31, |
|  | 2018 |  | 2017 |
Preferred stock dividends payable |  | $ | 2,901 |  | $ | 2,901 |
Accrued compensation and related charges |  |  | 2,058 |  |  | 3,205 |
Advances from customers |  |  | 1,061 |  |  | 924 |
Dividends payable by consolidated joint ventures |  |  | 552 |  |  | 533 |
Current portion of royalty payments |  |  | 431 |  |  | 575 |
Accrued income taxes |  |  | 375 |  |  | 270 |
Accrued professional services |  |  | 251 |  |  | 570 |
Other tax payable |  |  | 215 |  |  | 395 |
Other personnel related costs |  |  | 213 |  |  | 230 |
Accrued product warranty |  |  | 117 |  |  | 133 |
Other accrued liabilities |  |  | 1,016 |  |  | 1,413 |
|  | $ | 9,190 |  | $ | 11,149 |

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