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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies [Abstract]  
Disclosure of maturity analysis of operating lease payments [text block]
As of December 31, 2018, future minimum lease payments under noncancelable operating leases are as follows:
 
Duration
 
Amount
 
 
 
(in thousands)
 
January 1, 2019~December 31, 2019
 
$
2,361
 
January 1, 2020~December 31, 2020
 
 
1,601
 
January 1, 2021~December 31, 2021
 
 
386
 
January 1, 2022~December 31, 2022
 
 
298
 
January 1, 2023~December 31, 2023
 
 
182
 
January 1, 2024~December 31, 2024
 
 
46
 
 
 
$
4,874