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Accrued Expenses | 6 Months Ended
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Jun. 30, 2021
Accrued Expenses [Abstract] |
Accrued Expenses | 4. Accrued Expenses Accrued expenses and other current liabilities consisted of the following: ​
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​ | ​ | June 30, 2021 | ​ | December 31, 2020
(in thousands) |  | ​ | ​ | ​ | ​ | ​
Accrued employee compensation and benefits | ​ | $ | 3,751 | ​ | $ | 6,150
Accrued external research and development expenses | ​ |  | 3,028 | ​ |  | 1,772
Accrued professional fees | ​ |  | 1,058 | ​ |  | 940
Deferred rent | ​ |  | — | ​ |  | 1,389
Other | ​ |  | 1,218 | ​ |  | 702
Total | ​ | $ | 9,055 | ​ | $ | 10,953
​

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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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