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Marketable Securities - Available-for-sale Securities by Major Security Type (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Marketable Securities [Line Items]    
Amortized cost   $ 3,007
Gross unrealized holding gains   8
Gross unrealized holding losses   (5)
Estimated fair value $ 0 3,010
Corporate bonds and notes [Member]    
Marketable Securities [Line Items]    
Amortized cost   1,434
Gross unrealized holding gains   8
Gross unrealized holding losses   (2)
Estimated fair value   1,440
Municipal bonds [Member]    
Marketable Securities [Line Items]    
Amortized cost   1,573
Gross unrealized holding gains   0
Gross unrealized holding losses   (3)
Estimated fair value   $ 1,570