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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2019
Stockholders Equity Note [Abstract]  
Summary of Stock Option Activity

The following is a summary of stock option activity under the Plan for the three months ended March 31, 2019:  

 

 

Number of Shares

 

 

Weighted Average Exercise Price

 

 

Weighted Average Remaining Contractual Term (Years)

 

Aggregate Intrinsic Value

 

Outstanding at December 31, 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

Granted

 

 

1,250,000

 

 

 

0.28

 

 

 

 

 

 

 

Exercised

 

 

 

 

 

 

 

 

 

 

 

 

 

Cancelled/Forfeited

 

 

(83,333

)

 

 

0.28

 

 

 

 

 

 

 

Outstanding at March 31, 2019

 

 

1,166,667

 

 

$

0.28

 

 

9.08

 

$

 

Exercisable at March 31, 2019

 

 

112,498

 

 

$

0.28

 

 

8.43

 

$

 

Summary of Weighted Average Assumptions Used to Compute Fair Value

The following weighted average assumptions were used to compute the fair value of stock options granted during the three months ended March 31, 2019:

 

 

 

Three months ended March 31,

 

 

 

2019

 

Dividend yield

 

N/A

 

Expected volatility

 

 

147.6

%

Weighted average risk-free interest rate

 

 

2.6

%

Weighted average expected life (in years)

 

 

5.5

 

Weighted average grant date fair value

 

$

0.259

 

Summary of Warrant Activity

The following is a summary of warrant activity for the three months ended March 31, 2019:

 

 

 

Warrants

 

 

Exercise Price per

Share

 

Weighted Average

Exercise Price

 

 

Weighted Average

Remaining Life

(Years)

 

Outstanding at December 31, 2018

 

 

65,685,269

 

 

$0.01 - $10.00

 

$

0.22

 

 

 

5.75

 

Exercised

 

 

(4,119,500

)

 

 

 

 

0.01

 

 

 

 

 

Expired

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at March 31, 2019

 

 

61,565,769

 

 

$0.01 - $10.00

 

$

0.23

 

 

 

5.49