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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2019
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,

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Operating Expenses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Research and development

$

120

 

 

$

95

 

 

$

318

 

 

$

1,855

 

General and administrative

 

680

 

 

 

1,218

 

 

 

2,471

 

 

 

4,434

 

Total

$

800

 

 

$

1,313

 

 

$

2,789

 

 

$

6,289