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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2019
Stockholders Equity Note [Abstract]  
Summary of Stock Option Activity

The following is a summary of stock option activity under the Plan for the nine months ended September 30, 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

 

 

(100,000

)

 

 

0.28

 

 

 

 

 

 

 

Outstanding at September 30, 2019

 

 

1,150,000

 

 

$

0.28

 

 

9.4

 

$

 

Exercisable at September 30, 2019

 

 

766,663

 

 

$

0.28

 

 

9.4

 

$

 

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 nine months ended September 30, 2019:

 

 

 

Nine months ended September 30, 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 Recognized Share-based Compensation Cost

 

 

 

Three months ended September 30,

 

 

Nine months ended September 30,

 

(in thousands)

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Selling, general and administrative

 

$

54

 

 

$

116

 

 

$

160

 

 

$

58

 

Research and development

 

 

16

 

 

 

 

 

 

43

 

 

 

(63

)

Total

 

$

70

 

 

$

116

 

 

$

203

 

 

$

(5

)

Summary of Warrant Activity

The following is a summary of warrant activity for the nine months ended September 30, 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 - $1.00

 

$

0.22

 

 

 

5.75

 

Issued

 

 

701,373,564

 

 

 

 

 

0.06

 

 

 

 

 

Exercised

 

 

(7,898,853

)

 

 

 

 

0.01

 

 

 

 

 

Exchanged

 

 

(57,786,387

)

 

 

 

 

0.24

 

 

 

 

 

Outstanding at September 30, 2019

 

 

701,373,593

 

 

$0.01 - $0.06

 

$

0.06

 

 

 

5.05