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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Lease Payments under All Non-cancelable Operating Leases

Future minimum lease payments under all non-cancelable operating leases at December 31, 2017, were as follows (in thousands):

 

2018

 

$

475

 

2019

 

 

489

 

2020

 

 

500

 

2021

 

 

511

 

2022

 

 

523

 

2023

 

 

155

 

Total future minimum lease payments

 

$

2,653