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Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based compensation expense included in costs and expenses
   

Three Months Ended

March 31,

 
    2019     2018  
       
Share-based compensation expense:            
Cost of revenues   $     $ 15  
Sales and marketing     72       225  
Technology support     41       153  
General and administrative (1)     438       1,234  
Share-based compensation costs     551       1,627  
                 
Amount capitalized to internal use software           1  
Total share-based compensation costs   $ 551     $ 1,626  
Service based options granted during period
   

Three Months Ended

March 31,

 
    2019     2018  
             
Number of service-based options granted     1,042,883       1,500  
Weighted average grant date fair value   $ 1.81     $ 4.30  
Weighted average exercise price   $ 3.41     $ 8.19  
Fair value of stock options granted using the following weighted average assumptions
   

Three Months Ended

March 31,

 
    2019     2018  
             
Dividend yield            
Volatility     65 %     64 %
Risk-free interest rate     2.5 %     2.4 %
Expected life (years)     4.4       4.5  
Stock option exercises
   

Three Months Ended

March 31,

 
    2019     2018  
             
Number of stock options exercised     156,012       15,217  
Weighted average exercise price   $ 1.97     $ 4.80