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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Schedule of Changes in Common Stock Options

The following summarizes the changes in common stock options for the six months ended June 30, 2019:

 

 

 

Options

 

 

Weighted

Average

Exercise

Price

 

Outstanding at December 31, 2018

 

 

4,303,900

 

 

$

0.75

 

Granted

 

 

405,350

 

 

$

0.67

 

Expired

 

 

(745,000

)

 

$

2.00

 

Forfeited

 

 

(18,900

)

 

$

0.45

 

Outstanding at June 30, 2019

 

 

3,945,350

 

 

$

0.51

 

 

 

 

 

 

 

 

 

 

Options exercisable at June 30, 2019

 

 

1,983,375

 

 

$

0.49