Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Cash and Cash Equivalents and Restricted Cash (Details)

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Summary of Significant Accounting Policies - Cash and Cash Equivalents and Restricted Cash (Details)
$ in Thousands
 1 Months Ended
Jun. 30, 2021
Sep. 30, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounting Policies [Abstract]          
Cash and cash equivalents   $ 296,826 $ 15,517    
Restricted cash (Other assets)   2,518 0    
Total cash and cash equivalents, and restricted cash   299,344 15,517 $ 21,667 $ 9,815
Property, Plant and Equipment [Line Items]          
Restricted cash (Other assets)   2,518 $ 0    
Bank Guarantee          
Accounting Policies [Abstract]          
Restricted cash (Other assets)   1,300      
Property, Plant and Equipment [Line Items]          
Restricted cash (Other assets)   1,300      
Letter of Credit          
Property, Plant and Equipment [Line Items]          
Debt term 1 year        
Borrowing capacity   $ 1,200      
Facility          
Property, Plant and Equipment [Line Items]          
Area of property intended to be leased | ft²   80,000