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Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Debt and Convertible Debt

Debt and convertible debt consist of the following (in thousands):

 

     Year Ended December 31,  
     2017      2016  

Debt

      

Current portion of Senior Secured Debenture

    $ 8,377      $ —    

Non-current portion of Senior Secured Debenture

      2,611        —    
  

 

 

     

 

 

  

Total debt

    $ 10,988      $ —    
  

 

 

     

 

 

  

Convertible debt

      

2015 Shareholder Notes

    $ —        $ 1,709  

2015 Sely Note

      —          5,659  
     

 

 

  

Total convertible debt

    $ —        $ 7,368