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Other Long Term Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]    
Deferred credit $ 20,788 $ 20,788
Other income tax payable 54 118
Severance accruals 6,231 6,848
Other non-current non-financial liabilities $ 27,073 $ 27,754
Number of shares issuable upon conversion of convertible debenture (shares) 363,854