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Balance Sheet Detail (Tables)
3 Months Ended
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of inventory
     March 31,
2019
     December 31,
2018
 
     (in thousands)  

Inventories:

     

Work-in-process

   $ 474      $ 548  

Finished goods

     428        600  
  

 

 

    

 

 

 
   $ 902      $ 1,148