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Fair Value Measurements (Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring
$ in Thousands
Dec. 31, 2020
USD ($)
Liabilities:  
Total liabilities $ 3,911
Convertible preferred stock warrant liability  
Liabilities:  
Total liabilities 3,911
Level 3  
Liabilities:  
Total liabilities 3,911
Level 3 | Convertible preferred stock warrant liability  
Liabilities:  
Total liabilities $ 3,911