Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Summary of the Company's Outstanding Stock Warrants and Changes During the Period

A summary of the status of the Company’s outstanding stock warrants and changes during the period then ended is as follows:

 

    Number of Warrants     Weighted Average
Exercise Price
    Weighted Average Remaining Contractual Life (in years)  
Outstanding as of December 31, 2017     773,966     $ 5.99       4.1  
Expired     (1,202 )     15.60       -  
Exercised     (44,000 )     1.20       -  
Outstanding as of June 30, 2018     728,764     $ 6.26       3.6  
Warrants exercisable as of June 30, 2018     728,764     $ 6.26       3.6  

Summary of Stock Options and Changes During the Period

A summary of the stock options as of June 30, 2018 and changes during the period are presented below:

 

    Number of Shares     Weighted Average
Exercise Price
    Weighted Average Remaining Contractual Life (in years)  
Outstanding as of December 31, 2017     448,771     $ 15.50       6.23  
Expired     (26,923 )     10.07       -  
Outstanding as of June 30, 2018     421,848     $ 15.85       6.10  
Options vested and expected to vest as of June 30, 2018     421,848     $ 15.85       6.10  
Options vested and exercisable as of June 30, 2018     410,390     $ 15.99       6.05