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Restricted Cash (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Restricted Cash [Abstract]    
Schedule of Cash, Cash Equivalents, and Restricted Cash

Cash, cash equivalents, and restricted cash balances were as follows:

 

(in thousands)    June 30,
2019		      December 31,
2018		  

Cash and cash equivalents

    $ 352      $ 2,516  

Letters of credit

      1,012        1,012  

Security for credit cards

      50        50  
  

 

 

     

 

 

  

Total cash, cash equivalents and restricted cash shown in the statements of cash flows

    $ 1,414      $ 3,578  
  

 

 

     

 

 

  
(in thousands)    December 31,
2018		      December 31,
2017		  

Cash and cash equivalents

    $ 2,516      $ 3,999  

Convertible Notes

      —          238  

Letters of credit

      1,012        1,012  

Security for credit cards

      50        75  
  

 

 

     

 

 

  

Total cash, cash equivalents and restricted cash shown in the statement of cash flows

    $ 3,578      $ 5,324