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Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Accrued Liabilities |
Components of accrued liabilities | The components of accrued liabilities are summarized below (in thousands):
|  | As of December 31, |
|  | 2017 |  | 2016 |
Accrued compensation and related charges |  | $ | 3,205 |  | $ | 2,610 |
Preferred stock dividends payable |  |  | 2,901 |  |  | 2,901 |
Advance from customers |  |  | 924 |  |  | 238 |
Current portion of royalty payments |  |  | 575 |  |  | 575 |
Accrued professional services |  |  | 570 |  |  | 583 |
Dividends payable by consolidated joint ventures |  |  | 533 |  |  | 499 |
Other tax payable |  |  | 395 |  |  | 147 |
Accrued income taxes |  |  | 270 |  |  | 203 |
Other personnel related costs |  |  | 230 |  |  | 200 |
Accrued product warranty |  |  | 133 |  |  | 251 |
Other accrued liabilities |  |  | 1,413 |  |  | 1,053 |
|  | $ | 11,149 |  | $ | 9,260 |

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