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Notes Payable (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Estimated Future Principal Payments

As of June 30, 2018, the estimated future principal payments due are as follows:

 

Year Ending December 31,

      

(in thousands)

      

2018

   $ —    

2019

     5,454  

2020

     7,273  

2021

     7,273  
  

 

 

 

Total

   $ 20,000