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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 85,094 $ 157,898
Operating Account    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents 14,000 2,700
Money Market Funds    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents $ 71,100 80,200
Government Obligations    
Cash and Cash Equivalents [Line Items]    
Cash and cash equivalents   $ 75,000