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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation Expense

Stock-based compensation expense, net for the three months ended March 31 was as follows (in thousands):

 

     2018      2017  

Cost of revenues

   $ 56    $ 34

Selling, general and administrative

     542      180

Research and development

     138      40
  

 

 

    

 

 

 

Total stock-based compensation

   $ 736    $ 254
  

 

 

    

 

 

 
Summary of Compensation Expense by Type of Award

Compensation expense by type of award for the three months ended March 31 was as follows (in thousands):

 

     2018      2017  

Stock options

   $ 593    $ 254

ESPP

     143      —    
  

 

 

    

 

 

 

Total stock-based compensation

   $ 736    $ 254