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Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum lease payments, net of receipts due under terms of subleases under all operating leases

Future minimum lease payments, net of receipts due under the terms of subleases, under all operating leases at December 31, 2017 are as follows:

 

(in thousands)

   Future Lease
Payment
 

2018

     872  

2019

     501  

2020

     456  

2021

     281  

2022

     —    

2023

     —    
  

 

 

 
   $ 2,110