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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Stock Option Activity

A summary of the status of the Company’s stock option activity for the nine months ended September 30, 2019 is presented in the table and narrative below:

 

 

 

Options

 

 

Weighted

Average

Exercise

Price

 

Outstanding at January 1, 2019

 

 

14,950

 

 

$

5.14

 

Granted

 

 

5,398

 

 

 

2.28

 

Exercised

 

 

(1,142

)

 

 

3.34

 

Cancelled/Forfeited

 

 

(4,227

)

 

 

6.61

 

Outstanding at September 30, 2019

 

 

14,979

 

 

$

3.83

 

Options exercisable at September 30, 2019

 

 

6,139

 

 

$

5.46

 

Weighted-average fair value of options granted during

   the period

 

 

 

 

 

$

1.59

 
Assumptions Used to Value Options Granted The assumptions used to value options granted are as follows:

 

 

Nine Months Ended

 

 

 

September 30, 2019

 

 

September 30, 2018

 

Expected term of option

 

5.6 - 6.0 years

 

 

6.0 years

 

Expected volatility

 

73% - 82%

 

 

79% - 80%

 

Risk free interest rate

 

1.41% - 2.60%

 

 

2.62% - 2.98%

 

Expected dividend yield

 

 

0

%

 

 

0

%