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Accrued Liabilities | 3 Months Ended
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Mar. 31, 2018
Accrued Liabilities [Abstract] |
Accrued Liabilities | 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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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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