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Accrued Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2018
Accrued Liabilities [Abstract] |
Schedule of Accrued Liabilities | Accrued liabilities as of March 31, 2018 and December 31, 2017 were as follows (in thousands):
| March 31, 2018 |  | December 31, 2017
Salaries, employee benefits and related taxes | $ | 666 |  |  | $ | 1,389 |
Retention payments | 2,233 |  |  | 2,233 |
Professional fees | 161 |  |  | 287 |
CIRM upfront funding - current | 2,583 |  |  | 2,446 |
Other | 1,355 |  |  | 1,456 |
Total | $ | 6,998 |  |  | $ | 7,811 |

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