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Cash and Cash Equivalents - Reconciliation of Liabilities from Financing Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance beginning of year $ 36 $ 8,668
Cash flows (74) 77
Accumulated interest 1 2
Fair value Adjustment   1,183
Additions 54 12
Conversion   (9,695)
Exchange rate adjustment 3 (211)
Balance end of year 20 36
Lease liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance beginning of year 36 99
Cash flows (74) (75)
Accumulated interest 1 2
Additions 54 12
Exchange rate adjustment 3 (2)
Balance end of year $ 20 36
Convertible debt instruments    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance beginning of year   8,569
Cash flows   152
Fair value Adjustment   1,183
Conversion   (9,695)
Exchange rate adjustment   $ (209)