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Accrued Expenses (Tables)
6 Months Ended
Jun. 30, 2020
Accrued Expenses  
Summary of accrued expenses

As of June 30, 2020 and December 31, 2019, accrued expenses consist of the following (in thousands):

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As of

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June 30, 

    

December 31, 

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2020

​

2019

Accrued payroll and related expenses

​

$

3,580

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$

4,380

Accrued external research and development expense

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​

3,277

​

​

4,088

Accrued professional and consulting expense

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​

1,233

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​

929

Accrued other

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143

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213

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​

$

8,233

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$

9,610