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Available-for-Sale-Securities - Classification on Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities $ 91,452 $ 30,737
Cash and cash equivalents    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities 21,129 12,676
Marketable securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale debt securities $ 70,323 $ 18,061