Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Payments (Tables)

v3.10.0.1
Stock-Based Payments (Tables)
6 Months Ended
Jun. 30, 2018
Stock-Based Payments  
Summary of status of stock options and changes during the period

A summary of the status of stock options as of December 31, 2017 and June 30, 2018 and changes during the six months ended June 30, 2018 is presented below:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    

 

    

 

 

    

 

    

Aggregate

 

 

 

 

 

Weighted

 

Remaining

 

Intrinsic

 

 

 

 

 

Average

 

Contractual

 

Value

 

 

 

Shares

 

Exercise Price

 

Life (in years)

 

(in thousands)

 

Outstanding at December 31, 2017

 

2,846,668

 

$

9.25

 

8.2

 

$

5,713

 

Granted

 

1,282,952

 

 

10.88

 

 

 

 

 

 

Exercised

 

(103,057)

 

 

4.73

 

 

 

 

 

 

Cancelled

 

(168,417)

 

 

10.46

 

 

 

 

 

 

Outstanding at June 30, 2018

 

3,858,146

 

$

9.86

 

8.2

 

$

5,718

 

Exercisable at June 30, 2018

 

1,254,628

 

$

7.75

 

6.8

 

$

4,299

 

 

Schedule of weighted-average assumptions used in Black-Scholes option-pricing model

The fair value of each stock option granted was estimated on the date of grant using the Black-Scholes option-pricing model based on the following weighted-average assumptions:

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended June 30, 

 

Six Months Ended June 30, 

 

 

 

2018

    

2017

    

2018

    

2017

 

    

Weighted-average risk-free interest rate

2.79

%  

1.86

%  

2.47

%  

2.03

%

 

Expected dividend yield

 -

%  

 -

%  

 -

%  

 -

%

 

Expected option term (in years)

5.74

 

5.72

 

6.03

 

6.00

 

 

Volatility

91.16

%  

91.42

%  

90.37%

%  

87.05

%

 

 

Summary of stock-based compensation expense for stock options granted to employee and non-employees

The following table summarizes the stock-based compensation expense for stock options and restricted common stock granted to employees and non-employees recorded in the Company’s condensed consolidated statements of operations:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended June 30, 

 

Six Months Ended June 30, 

 

    

2018

    

2017

    

2018

    

2017

    

Research and development

    

$

670

    

$

448

    

$

1,235

    

$

778

 

General and administrative

 

 

1,074

 

 

708

 

 

2,205

 

 

1,262

 

Total stock-based compensation expense

 

$

1,744

 

$

1,156

 

$

3,440

 

$

2,040