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Significant Accounting Policies - Comprehensive Income (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]      
Accumulated other comprehensive income $ 9,203,000 $ 48,880,000 $ 233,000
Tax from unrealized gains and losses on marketable securities 200,000 300,000 90,000
Reclassifications from AOCI $ 0 25,000 $ 0
Reclassifications from AOCI, tax   $ 10,000