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Share-Based Payments (Tables)
6 Months Ended
Jun. 30, 2021
Stock Option Plan 2015  
Share-Based Payments  
Summary of information regarding stock option awards

Weighted

average

exercise

Aggregate

price in

intrinsic

SOP 2015

Options

    

$ per share

    

value

Outstanding as of January 1, 2021

202,374

82.71

 

  

Granted

 

Exercised

 

Forfeited

(32,824)

 

88.93

 

Outstanding as of June 30, 2021

169,550

 

81.51

$

Vested and exercisable as of June 30, 2021

169,141

 

81.48

$

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, 2021

 

442,844

30.89

 

 

  

Granted 

 

 

 

  

Exercised 

 

 

 

  

Forfeited 

 

(101,204)

32.82

 

Outstanding as of June 30, 2021

 

341,640

30.31

$

Vested and exercisable as of June 30, 2021

 

231,403

34.75

$

Summary of information regarding restricted stock awards

Weighted

average fair

2017 Plan

RSUs

value in $ per share

Outstanding as of January 1, 2021

151,269

14.56

Granted

Vested and issued

(42,752)

13.98

Forfeited

(30,640)

13.62

Outstanding as of June 30, 2021

77,877

14.19

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, 2021

 

25,815

19.04

  

Granted

 

  

Exercised

 

  

Forfeited

 

(13,053)

18.20

Outstanding as of June 30, 2021

 

12,762

19.90

$

Vested and exercisable as of June 30, 2021

 

8,510

19.16

$

2020 Share Incentive Plan  
Share-Based Payments  
Summary of information regarding stock option awards

    

Weighted

average

exercise

Aggregate

price in $

intrinsic

2020 Plan

    

Options

    

per share

    

value

Outstanding as of January 1, 2021

 

296,805

10.18

 

  

Granted 

 

21,000

1.39

 

  

Exercised 

 

 

  

Forfeited 

 

(107,325)

5.70

 

  

Outstanding as of June 30, 2021

 

210,480

9.87

$

Vested and exercisable as of June 30, 2021

 

$

Summary of assumptions used for valuation of options

Input parameters

    

Expected volatility

 

77.3

%

Expected term of options (in years)

 

5.5

Range of risk-free interest rate

 

1.0

%

Dividend yield

 

2021 Inducement Share Incentive Plan  
Share-Based Payments  
Summary of information regarding stock option awards

    

Weighted

 

average

 

exercise

Aggregate

price in $

intrinsic

2021 Inducement Plan

    

Options

    

per share

    

value

Outstanding as of January 1, 2021

 

 

 

  

Granted 

129,250

1.66

 

  

Exercised 

 

  

Forfeited 

 

  

Outstanding as of June 30, 2021

 

129,250

1.66

$

Vested and exercisable as of June 30, 2021

 

 

$

Summary of assumptions used for valuation of options

Input parameters

    

 

Expected volatility

 

75.3% - 76.3%

Expected term of options (in years)

 

6.1

Risk-free interest rate

 

1.02% - 1.16%

Dividend yield