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Accrued Expenses
6 Months Ended
Jun. 30, 2018
Text Block [Abstract]  
Accrued Expenses

4. Accrued Expenses

Accrued expenses are as follows:

 

 

 

December 31,

 

 

June 30,

 

 

 

2017

 

 

2018

 

Accrued research and development

 

$

2,463,808

 

 

$

3,478,400

 

Accrued payroll liabilities

 

 

251,491

 

 

 

1,461,919

 

Other

 

 

175,406

 

 

 

180,859

 

Total

 

$

2,890,705

 

 

$

5,121,178