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Stockholders' Equity and Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Schedule of Stock Option Plan Activity

A summary of stock option activity under the Plans for the three months ended March 31, 2019 is as follows:

 

    Number of shares     Weighted Avg. Exercise Price     Weighted Avg. Remaining Contractual Life     Aggregate Intrinsic Value  
Options outstanding - January 1, 2019     2,482,009     $ 5.10                  
Options granted     291,000     $ 6.30                  
Options exercised     -     $ -                  
Options cancelled/forfeit     (44,287 )   $ 6.24                  
Options outstanding - March 31, 2019     2,728,722     $ 5.21       5.76     $ 5,994  
Options exercisable     1,398,665     $ 4.74       6.02     $ 3,763  
Options vested and expected to vest     2,604,215     $ 5.17       5.78     $ 5,815  

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:

 

    2019  
Weighted-average fair value of options granted   $ 3.71  
Expected terms (in years)     5.8 - 6.1  
Expected volatility     64% - 67 %
Risk-free interest rate     2.54% - 2.68 %
Dividend yield     -  

Schedule of Stock Option Outstanding and Exercisable

The following table summarizes information about stock options outstanding and exercisable at March 31, 2019:

 

      Options Outstanding     Options Exercisable  
            Weighted                    
            Average                    
            Remaining     Weighted           Weighted  
Range of           Contractual     Average           Average  
Exercise     Number     Life in     Exercise     Number     Exercise  
Prices     Outstanding     Years     Price     Exercisable     Price  
$1.47 - $2.60       828,748       7.48     $ 2.04       479,534     $ 2.13  
$2.76 - $4.22       535,871       6.73     $ 3.96       449,399     $ 3.98  
$5.61 - $6.30       390,350       8.47     $ 6.21       98,096     $ 5.97  
$6.64 - $8.99       968,723       2.69     $ 8.00       366,606     $ 8.24  
$42.80       5,030       1.37     $ 42.80       5,030     $ 42.80  
$1.47 - $42.80       2,728,722       5.76     $ 5.21       1,398,665     $ 4.74  

Schedule of Restricted Stock Units Activity

A summary of the Company’s RSU activity and related information for the three months ended March 31, 2019 is as follows:

 

    Number of RSUs     Weighted Average Grant Date Fair Value  
RSUs unvested - January 1, 2019     1,275,680     $ 2.16  
RSUs granted     135,000     $ 6.30  
RSUs vested     (34,090 )   $ 2.20  
RSUs cancelled/forfeit     -          
RSUs unvested at March 31, 2019     1,376,590     $ 2.56  

Schedule of Warrants Activity

A summary of warrant activity for the three months ended March 31, 2019 is as follows:

 

    Number of Shares Subject to Warrants Outstanding     Weighted Avg. Exercise Price  
             
Warrants outstanding - January 1, 2019     2,206,973     $ 1.91  
Granted     -          
Exercised     (474,055 )     1.79  
Expired     -          
Warrants outstanding and exercisable - March 31, 2019     1,732,918     $ 1.94  
Weighted average remaining contractual life of the outstanding warrants in years - March 31, 2019     2.79          

Schedule of Warrants Outstanding and Warrants Exercisable

A list of the warrants outstanding as of March 31, 2019 is included in the following table:

 

    Warrants Outstanding and Exercisable
        Warrants     Exercise     Expiration
Warrant Series   Issue Date   Outstanding     Price     Date
Lender warrants   5/11/2015     125,000     $ 1.79     5/11/2025
Settlement warrants   8/16/2016     40,000     $ 3.75     8/16/2021
PIPE investor and placement agent warrants   12/27/2016     952,532     $ 1.79     12/27/2019
Lender warrants   7/19/2017     615,386     $ 2.08     7/19/2024
          1,732,918     $ 1.94      

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  
    Three Months Ended     Three Months Ended  
    March 31, 2019     March 31, 2018  
Employees - selling, general and administrative   $ 638       593  
Directors - selling, general and administrative     75       50  
Consultants - selling, general and administrative     75       108  
Total   $ 788     $ 751