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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 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

 

 

Six Months Ended

 

 

June 30,

 

 

June 30,

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Operating Expenses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Research and development

$

112

 

 

$

877

 

 

$

198

 

 

$

1,759

 

General and administrative

 

829

 

 

 

1,278

 

 

 

1,791

 

 

 

3,216

 

Total

$

941

 

 

$

2,155

 

 

$

1,989

 

 

$

4,975