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Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash $ 1,001 $ 998 $ 802
Money Market Funds      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash 800    
Guaranteed Investment Certificate      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash $ 200