Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

v3.19.3
Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Fair Value of Options Estimated on Date of Grant Using Black-Scholes Option Pricing Model The fair value of the options was estimated on the date of grant using a Black-Scholes option pricing model with the following assumptions:

 

 

 

 

September 30,

 

 

 

2019

 

 

2018

 

Range of expected option life

 

5.5 - 6 years

 

 

5.5 - 6 years

 

Expected volatility

 

74.69% - 80.59%

 

 

74.05% - 81.47%

 

Risk-free interest rate

 

1.42 - 2.66%

 

 

2.32 - 2.98%

 

Expected dividend yield

 

 

 

 

 

 

 

Summary of Stock Option Activity

The following table summarizes stock option activity during the nine months ended September 30, 2019:

 

 

 

Number of

shares

 

 

Weighted

average

exercise

price

 

 

Weighted

average

remaining

contractual life

Balance, December 31, 2018

 

 

3,092,606

 

 

$

7.32

 

 

7.3 years

Granted

 

 

1,094,756

 

 

$

7.95

 

 

 

Exercised

 

 

(408,170

)

 

$

5.94

 

 

 

Expired/forfeited/cancelled

 

 

(678,645

)

 

$

7.84

 

 

 

Balance, September 30, 2019

 

 

3,100,547

 

 

$

7.61

 

 

6.9 years

Vested

 

 

1,973,108

 

 

$

7.31

 

 

5.9 years

Vested and expected to vest

 

 

3,100,547

 

 

$

7.61

 

 

6.9 years

Summary of Restricted Stock Units Activity

The following table summarizes restricted stock units (RSUs), activity during the nine months ended September 30, 2019.

 

 

 

Number of

shares

 

Balance, December 31, 2018

 

 

981,453

 

Granted

 

 

664,210

 

Vested and settled

 

 

(421,552

)

Expired/forfeited/cancelled

 

 

(455,437

)

Balance, September 30, 2019

 

 

768,674

 

Expected to vest

 

 

517,474