Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Tables)

v3.20.2
Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2020
Stock-based Compensation  
Weighted Average Assumptions

The fair value of the stock options granted during the three and six months ended June 30, 2020 and 2019, was estimated based on the following weighted average assumptions:

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Three Months Ended June 30, 

 

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Six Months Ended June 30, 

 

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2020

    

2019

 

    

2020

    

2019

 

Dividend yield

 

0

%  

0

%

 

0

%  

0

%

Expected volatility

 

100

%  

102

%

 

100

%  

103

%

Risk-free interest rate

 

0.40

%  

2.21

%

 

0.77

%  

2.51

%

Expected term

 

5.93 years

​

5.60 years

​

 

5.66 years

​

5.60 years

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Stock Option Activity

Stock option activity for the six months ended June 30, 2020, was as follows:

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Weighted

    

Weighted

    

Aggregate

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Average

​

Average

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Intrinsic

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Exercise

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Contractual 

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Value

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Number of

​

Price

​

Term

​

(in

​

​

shares

​

Per Share

​

(in years)

​

thousands)

Outstanding at beginning of year

 

1,839,623

​

$

20.42

 

6.88

 

$

26,829

Granted

 

187,811

​

 

21.12

 

  

 

​

  

Exercised

 

(2,000)

​

 

4.77

 

  

 

​

  

Forfeited, expired or cancelled

 

(17,036)

​

 

147.00

 

  

 

​

  

Outstanding at end of period

 

2,008,398

​

$

19.43

 

6.75

​

$

16,254

Exercisable at end of period

 

1,604,258

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$

19.70

 

6.18

​

$

15,169

Stock-based Compensation Expense

The following table shows total stock-based compensation expense for stock options and ESPP in the condensed consolidated statements of operations and comprehensive loss (in thousands):

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Three Months Ended June 30, 

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Six Months Ended June 30, 

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2020

    

2019

    

2020

    

2019

Research and development

​

$

—

​

$

59

​

$

—

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$

108

General and administrative

​

 

773

​

 

952

​

 

2,561

​

 

2,631

Total stock-based compensation expense

​

$

773

​

$

1,011

​

$

2,561

​

$

2,739