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Commitments, Contingencies, and Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments

The following table presents the future minimum rental commitments at December 31, 2018, by year (in thousands):

 

Year  Amount 
2019  $72 
2020   73 
2021   74 
2022   76 
2023   6