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Commitments (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018 are as follows:

 

(in thousands)    Future Lease
Payment
 

2019

     885  

2020

     916  

2021

     348  
  

 

 

 
   $ 2,149