Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

v3.8.0.1
Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of option activity
A summary of option activity for the nine months ended September 30, 2017 is as follows:
 
 
Options Outstanding
 
 
Number of
shares
 
Weighted‑average
exercise price
 
Fair value of
options
granted
 
Weighted average
remaining
contractual term
(in years)
Balance, December 31, 2016
 
1,849,359

 
$
5.57

 
    
 
 
Granted
 
578,611

 
$
0.74

 
$
301,743

 
 
     Forfeited
 
(18,391
)
 
$
5.63

 
 
 
 
Balance, September 30, 2017
 
2,409,579

 
$
4.41

 
 
 
8.12
Exercisable at September 30, 2017
 
1,467,463

 
$
5.25

 
 
 
7.65
Schedule of stock-based compensation expense
Stock‑based compensation expense recognized for the three and nine months ended September 30, 2017 and 2016 was as follows:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2017
 
2016
 
2017
 
2016
Research and development
 
$
41,323

 
$
43,861

 
$
123,883

 
$
95,013

General and administrative
 
222,924

 
243,913

 
728,327

 
1,344,181

Total stock-based compensation
 
$
264,247

 
$
287,774

 
$
852,210

 
$
1,439,194