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Accrued Expenses | 12 Months Ended
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Dec. 31, 2020
Accrued Expenses |
Accrued Expenses | 6. Accrued Expenses Accrued expenses consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
​ | ​ | December 31,
​ |  | 2020 |  | 2019
External research and development expenses | ​ | $ | 12,820 | ​ | $ | 735
Employee related expenses | ​ | ​ | 5,323 | ​ | ​ | 4,971
Intellectual property and patent related fees | ​ | ​ | 4,240 | ​ | ​ | 3,725
Sublicensing expenses | ​ | ​ | 771 | ​ | ​ | 11,416
Professional service expenses | ​ | ​ | 533 | ​ | ​ | 674
Other expenses | ​ | ​ | 359 | ​ | ​ | 599
Total accrued expenses | ​ | $ | 24,046 | ​ | $ | 22,120
​

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