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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2015
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,

 

 

2015

 

 

2014

 

 

2015

 

 

2014

 

Operating Expenses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Research and development

$

779

 

 

$

394

 

 

$

2,016

 

 

$

761

 

General and administrative

 

1,487

 

 

 

1,162

 

 

 

6,475

 

 

 

2,288

 

Total

$

2,266

 

 

$

1,556

 

 

$

8,491

 

 

$

3,049