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Accrued Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2018
Accrued Liabilities [Abstract] |
Schedule of Accrued Liabilities | Accrued liabilities as of June 30, 2018 and December 31, 2017 were as follows (in thousands):
| June 30, 2018 |  | December 31, 2017
Salaries, employee benefits and related taxes | $ | 1,415 |  |  | $ | 1,389 |
Retention payments | — |  |  | 2,233 |
CIRM upfront funding - current | 2,583 |  |  | 2,446 |
Other | 1,301 |  |  | 1,743 |
Total | $ | 5,299 |  |  | $ | 7,811 |

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