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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Schedule of Common Stock Reserved for Future Issuance

Common stock reserved for future issuance as of September 30, 2018 is as follows:

 

Issued and Outstanding:

 

 

 

 

Stock options

 

 

3,637,502

 

Warrants for common stock

 

 

67,238

 

Shares reserved for issuance under the ESPP

 

 

363,340

 

Shares reserved for future award grants

 

 

300,388

 

Total

 

 

4,368,468

 

 

Summary of Allocation of Non-Cash Stock-Based Compensation Expense for All Stock Awards

The following table summarizes the allocation of the Company’s non-cash stock-based compensation expense for all stock awards during the periods presented (in thousands):

 

 

 

Three Months Ended

September 30,

 

 

Nine Months Ended

September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Research and development

 

$

842

 

 

$

657

 

 

$

2,377

 

 

$

1,229

 

General and administrative

 

 

1,085

 

 

 

834

 

 

 

2,743

 

 

 

1,847

 

Total

 

$

1,927

 

 

$

1,491

 

 

$

5,120

 

 

$

3,076