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Summary of Significant Accounting Policies - Impairment to Equity-based Compensation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
item
Jun. 30, 2020
USD ($)
Accounting Policies [Abstract]        
Impairment losses | $ $ 0 $ 0 $ 0 $ 0
Number of reporting units | item     1