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Accrued Expenses and Other Liabilities | 3 Months Ended
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Dec. 31, 2018
Payables and Accruals [Abstract] |
Accrued Expenses and Other Liabilities | Accrued Expenses and Other Liabilities Accrued expenses and other liabilities consisted of the following (in thousands):
|  | December 31, |  | September 30,
|  | 2018 |  | 2018 |  | 2017
Compensation and benefits |  | $ | 3,296 |  |  | $ | 2,500 |  |  | $ | 1,662 |
Research and development costs |  | 9,362 |  |  | 6,659 |  |  | 339 |
UCLB milestone |  | 638 |  |  | 653 |  |  | — |
Professional fees |  | 4,130 |  |  | 3,099 |  |  | 300 |
Deferred rent |  | 561 |  |  | 569 |  |  | 197 |
Other liabilities |  | 1,067 |  |  | 623 |  |  | 589 |
Total accrued expenses and other liabilities |  | $ | 19,054 |  |  | $ | 14,103 |  |  | $ | 3,087 |
As of December 31, 2018, other liabilities included U.S. tax payable of $0.6 million and the current portion of other long-term payables and lease incentive liability, which together amounted to $0.4 million. As of each September 30, 2018 and 2017, the current portion of other long-term payables and lease incentive liability, together amounted to $0.4 million.

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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=6877327&loc=d3e13212-122682 + Details
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- References No definition available. + Details
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