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Accrued Expenses | 9 Months Ended
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Sep. 30, 2021
Accrued Liabilities, Current [Abstract] |
Accrued Expenses | 3. ACCRUED EXPENSES Accrued expenses consisted of the following as of September 30, 2021 and December 31, 2020:
(in thousands) |  | SEPTEMBER 30, 2021 |  |  | DECEMBER 31, 2020 |
Research and development |  | $ | 1,981 |  |  | $ | 1,065 |
Employee expenses |  |  | 2,097 |  |  |  | 1,912 |
Professional fees |  |  | 364 |  |  |  | 185 |
Other |  |  | 303 |  |  |  | 112 |
Asset purchase obligation |  |  | — |  |  |  | 990 |
|  | $ | 4,745 |  |  | $ | 4,264 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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