Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Cash, Cash Equivalents, and Restricted Cash) (Details)

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Significant Accounting Policies (Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Significant Accounting Policies        
Cash and cash equivalents $ 120,879 $ 97,804 $ 75,251  
Restricted cash 1,000   1,000  
Total cash, cash equivalents and restricted cash $ 121,879 $ 98,804 $ 76,251 $ 62,413