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Supplemental Information for Statement of Cash Flows (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Supplemental Information for Statement of Cash Flows        
Cash and cash equivalents $ 21,491 $ 4,268    
Restricted cash 7,860 7,859    
Total $ 29,351 $ 12,127 $ 13,030 $ 15,215