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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Schedule of Estimated Stock-Based Compensation Expense

Stock-based compensation expense, net of estimated forfeitures, is reflected in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

September 30,

 

 

September 30,

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Operating Expenses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Research and development

$

1,419

 

 

$

1,005

 

 

$

4,400

 

 

$

2,608

 

General and administrative

 

2,160

 

 

 

1,646

 

 

 

6,701

 

 

 

5,420

 

Total

$

3,579

 

 

$

2,651

 

 

$

11,101

 

 

$

8,028