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Share-Based Payments (Tables)
6 Months Ended
Jun. 30, 2020
Share-Based Payments  
Summary of information regarding restricted stock awards

Weighted

average fair

2017 Plan

    

RSUs

    

value per share

Outstanding as of January 1, 2020

 

901,686

 

3.69

Granted

 

1,557,300

1.35

Vested and issued

 

(334,210)

2.03

Forfeited

 

(230,792)

1.83

Outstanding as of June 30, 2020

 

1,893,984

 

1.83

Stock Option Plan 2015  
Share-Based Payments  
Summary of information regarding stock option awards

Weighted

average

exercise

Aggregate

price in

intrinsic

Stock Option Plan 2015

    

Options

    

$ per share

    

value

Outstanding as of January 1, 2020

2,290,594

 

8.33

 

  

Granted

 

 

Exercised

 

 

Forfeited

63,179

 

9.02

 

Outstanding as of June 30, 2020

2,227,415

8.31

$

Vested and exercisable as of June 30, 2020

2,073,469

 

8.23

$

2017 Share Incentive Plan  
Share-Based Payments  
Summary of information regarding stock option awards

    

Weighted

average

exercise

Aggregate

price in $

intrinsic

2017 Plan

    

Options

    

per share

    

value

Outstanding as of January 1, 2020

 

4,422,664

3.55

 

 

  

Granted 

 

1,290,500

1.35

 

 

  

Exercised 

 

 

 

  

Forfeited 

 

(748,874)

2.56

 

 

  

Outstanding as of June 30, 2020

 

4,964,290

3.13

$

Vested and exercisable as of June 30, 2020

 

1,968,950

4.21

$

Summary of assumptions used for valuation of options

Input parameters

    

Range of expected volatility

 

63.8% - 64.0%

Expected term of options (in years)

 

6.1

Range of risk-free interest rate

 

0.8% - 1.5%

Dividend yield

 

2019 Inducement Plan  
Share-Based Payments  
Summary of information regarding stock option awards

Weighted

average

exercise

Aggregate

price in $

intrinsic

2019 Inducement Plan

    

Options

    

per share

    

value

Outstanding as of January 1, 2020

 

605,650

2.14

 

  

Granted

 

182,000

1.35

 

  

Exercised

 

 

  

Forfeited

 

(392,000)

2.02

 

  

Outstanding as of June 30, 2020

 

395,650

1.96

$

Vested and exercisable as of June 30, 2020

 

40,224

2.64

 

Summary of assumptions used for valuation of options

Input parameters

    

Expected volatility

 

63.7% - 64.0%

Expected term of options (in years)

 

6.1

Risk-free interest rate

 

1.0% - 1.4%

Dividend yield

 

Inducement Awards Outside of the 2019 Inducement Plan  
Share-Based Payments  
Summary of assumptions used for valuation of options

Input parameters

    

Expected volatility

 

59.8

%

Expected term of options (in years)

 

6.1

Range of risk-free interest rate

 

2.9

%

Dividend yield