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Stockholders' Equity and Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Schedule of Stock Option Plan Activity

A summary of stock option activity under the Plans for the nine months ended September 30, 2018 is as follows:

 

    Number of shares     Weighted Avg. Exercise Price     Weighted Avg. Remaining Contractual Life     Aggregate Intrinsic Value  
Options outstanding - January 1, 2018     2,259,979     $ 5.51                  
Options granted     295,000     $ 1.79                  
Options exercised     -     $ -                  
Options cancelled/forfeit     (29,974 )   $ 3.36                  
Options outstanding - September 30, 2018     2,525,005     $ 5.10       5.79     $ 631  
Options exercisable     1,277,557     $ 5.12       6.22     $ 258  
Options vested and expected to vest     2,396,105     $ 5.10       5.80     $ 585  

Schedule of Fair Value Assumptions

The table below illustrates the fair value per share determined by the Black-Scholes-Merton option pricing model with the following assumptions used for valuing options granted to employees:

 

    2018  
Weighted-average fair value of options granted   $ 1.42  
Expected terms (in years)     5.8 - 6.1  
Expected volatility     76% - 126 %
Risk-free interest rate     2.05 - 3.00 %
Dividend yield     -  

Schedule of Shares Outstanding and Exercisable

The following table summarizes information about stock options outstanding and exercisable at September 30, 2018:

 

      Options Outstanding     Options Exercisable  
            Weighted                    
            Average     Weighted           Weighted  
            Remaining     Average           Average  
Range of     Number     Contractual     Exercise     Number     Exercise  
Exercise Prices     Outstanding     Life in Years     Price     Exercisable     Price  
  $1.47 - $2.60       851,000       8.01     $ 2.04       367,921     $ 2.18  
  $3.04 - $4.50       547,031       7.23     $ 3.96       392,138     $ 3.98  
  $5.49 - $6.36       101,536       4.82     $ 5.98       99,658     $ 5.98  
  $6.64 - $8.99       1,020,408       3.29     $ 7.98       412,810     $ 8.15  
  $42.80       5,030       1.87     $ 42.80       5,030     $ 42.80  
  $1.47 - $42.80       2,525,005       5.79     $ 5.10       1,277,557     $ 5.12  

Schedule of Restricted Stock Units Activity

A summary of the Company’s RSU activity and related information for the nine months ended September 30, 2018 is as follows:

 

    Number of RSUs     Weighted Average Grant Date Fair Value  
RSUs unvested - January 1, 2018     1,298,946     $ 2.42  
RSUs granted     136,360       2.20  
RSUs vested     (125,536 )     3.94  
RSUs cancelled/forfeit     -          
RSUs unvested at September 30, 2018     1,309,770     $ 2.16  

Schedule of Warrants Activity

A summary of warrant activity for the nine months ended September 30, 2018 is as follows:

 

    Number of Shares Subject to Warrants Outstanding     Weighted Avg. Exercise Price  
             
Warrants outstanding - January 1, 2018     6,264,215     $ 1.91  
Granted     -          
Exercised     (1,798,558 )     1.79  
Expired     (115,688 )     6.94  
Warrants outstanding and exercisable - September 30, 2018     4,349,969     $ 1.90  
Weighted average remaining contractual life of the outstanding warrants in years - September 30, 2018     2.06          

Schedule of Warrants Outstanding and Warrants Exercisable

A list of the warrants outstanding as of September 30, 2018 is included in the following table:

 

    Warrants Outstanding   Warrants Exercisable
        Warrants     Exercise     Warrants     Expiration
Warrant Series   Issue Date     Outstanding       Price       Exercisable     Date
Lender warrants   5/11/2015     125,000     $ 1.79       125,000     5/11/2025
Settlement warrants   8/16/2016     40,000     $ 3.75       40,000     8/16/2021
Placement Agent Warrants   12/27/2016     210,313     $ 1.79       210,313     12/27/2019
PIPE Investor Warrants   12/27/2016     3,359,270     $ 1.79       3,359,270     12/27/2019
Lender warrants   7/19/2017     615,386     $ 2.08       615,386     7/19/2024
          4,349,969     $ 1.90       4,349,969      

Schedule of Stock Based Compensation Granted to Employees Directors Consultants

The Company recorded stock-based compensation related to equity instruments granted to employees, directors and consultants as follows:

 

    For the     For the     For the     For the  
    Three Months Ended     Three Months Ended     Nine months Ended     Nine months Ended  
    September 30, 2018     September 30, 2017     September 30, 2018     September 30, 2017  
Employees - selling, general and administrative   $ 527     $ 598     $ 1,790     $ 2,050  
Directors - selling, general and administrative     75       50       160       155  
Consultants - selling, general and administrative     -       -       108       60  
Total   $ 602     $ 648     $ 2,058     $ 2,265