Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Leases (Narrative) (Details)

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Leases (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Rental expense   $ 82 $ 100
Operating lease right-of-use assets $ 20,936  
Operating lease liability $ 21,737    
Option to extend description The Company is a party to several lease agreements for its facilities, the latest of which has been extended until midst 2026. The Company has the option to extend certain agreements for additional periods, the earliest of which is until the end of January 2024 and the latest is until the end of October 2028. During the extended lease period, the aggregate annually rental payments will increase by 2%-3% each year.    
Adjustments for New Accounting Pronouncement [Member]      
Operating lease right-of-use assets $ 27,400