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Available-for-Sale-Securities - Classification on Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities $ 30,737 $ 22,768
Cash and cash equivalents    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities 12,676 11,643
Marketable securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities $ 18,061 $ 11,125