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Commitments and contingencies (Table)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Future minimum lease payments under non-cancelable leases, by year and in the aggregate, as of December 31, 2018 (in thousands) are as follows:
 
Years Ending December 31
 
 
 
2019
 
$
334
 
2020
 
 
347
 
2021
 
 
353
 
2022
 
 
202
 
2023
 
 
176
 
Thereafter
 
 
708
 
Total minimum lease payments
 
$
2,120