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6. STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of options activity

As of March 31, 2018, we had outstanding options to acquire 553,282 shares of our common stock, of which options to acquire 100,211 shares were exercisable. The following summarizes all of our option transactions for the three months ended March 31, 2018:

 

Outstanding Options

Under the 2006 Plan

   Shares    

Weighted Average

Exercise price Per Common Share

    

Weighted Average Remaining

Contractual Life

(in years)

    

Aggregate

Intrinsic

Value

  
                         
Balance, December 31, 2017     420,149     $ 6.82                  
Granted     133,133       10.05                  
Balance, March 31, 2018     553,282       7.05       7.95     $ 3,487,601  
Exercisable at March 31, 2018     100,211       4.39       4.53       1,003,291  
Schedule of RSA activity

The following summarizes all unvested RSA’s activities during the three months ended March 31, 2018:

 

         

Weighted-

Average

        
          Remaining     Weighted-  
          Contractual     Average  
    RSA's     Term (Years)     Fair Value  
RSA's unvested at December 31, 2017     447,351             $ 6.17  
Changes during the period                        
             Granted     462,701             $ 10.13  
             Vested     (625,818 )           $ 6.03  
RSA's unvested at March 31, 2018     284,234       1.03     $ 8.93