Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Tables)

v3.8.0.1
Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Share-based Compensation [Abstract]  
Schedule of stock-based compensation expense
The amount of stock based compensation expense recognized for the three months ended March 31, 2018 and 2017 as follows: 
 
 
Three Months Ended March 31,
 
 
2018
 
2017
Research and development
 
$
11,497

 
$
48,852

General and administrative
 
207,382

 
283,367

Sales and marketing
 
23,945

 

Total stock-based compensation
 
$
242,824

 
$
332,219

Summary of option activity
A summary of option activity for the three months ended March 31, 2018 is as follows:
 
 
Options Outstanding
 
 
Number of shares
 
Weighted average exercise price
 
Grant date fair value of options
 
Weighted average remaining contractual term (in years)
Balance at December 31, 2017
 
2,823,489

 
$
3.93

 


 
7.29
Granted
 
1,030,070

 
$
3.77

 
$
2,335,255

 

Exercised
 
(143,148
)
 
$
2.53

 
 
 
 
Forfeited
 
(301,027
)
 
$
2.21

 


 

Balance at March 31, 2018
 
3,409,384

 
$
4.09

 


 
9.48
Exercisable at March 31, 2018
 
1,671,978

 
$
5.03

 


 
6.68
Activity for the market-based options was as follows for the three months ended March 31, 2018:

 
 
Options Outstanding
 
 
Number of shares
 
Weighted average exercise price
 
Weighted average remaining contractual term (in years)
 
Aggregate intrinsic value (1)
Balance at December 31, 2017
 

 
 
 
 
 
 
Granted
 
500,000

 
$
4.24

 
 
 
 
Exercised
 

 
 
 
 
 
 
Forfeited
 

 
 
 
 
 
 
Balance at March 31, 2018
 
500,000

 
$
4.24

 
9.99
 
0
Exercisable at March 31, 2018
 

 
 
 
 
 
 
(1) The aggregate intrinsic value in the above table represents the total pre-tax amount that a participant would receive if the option had been exercised on the last day of the respective fiscal period. Options with a market value less than its exercise value are not included in the intrinsic value amount.
Schedule of fair value assumptions for options
The following table shows the assumptions used to compute stock-based compensation expense for stock options granted to employees and members of the board of directors under the Black-Scholes valuation model, and the assumptions used to compute stock-based compensation expense market-based stock option grants under a Monte Carlo simulation, for the three months ended March 31, 2018:
 
Service-based options
 
 
Expected dividend yield
 
—%
Expected volatility
 
55 - 65%
Expected life (in years)
 
5.0 - 6.25
Risk-free interest rate
 
2.53 - 2.69%
 
 
Market-based options
 
 
Expected dividend yield
 
—%
Expected volatility
 
60%
Expected life (in years)
 
10
Risk-free interest rate
 
2.84%
Nonvested Restricted Stock Shares Activity
The following table summarizes the Company's RSA grants for the three months ended March 31, 2018:
    
 
 
Non-vested RSAs Outstanding
 
 
Number of shares
 
Weighted average grant date fair value
Non-vested RSAs at December 31, 2017
 

 
$

Granted
 
400,000

 
$
4.24

Vested
 

 
$

Forfeited
 

 
$

Non-vested RSAs at March 31, 2018
 
400,000