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Basis of Presentation and Summary of Significant Accounting Policies - Warrants (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative financial instruments      
Derivative financial instruments—warrants $ 0 $ 285  
Warrants to purchase Common Stock | Black Scholes Option Pricing Method      
Derivative financial instruments      
Derivative financial instruments—warrants $ 0 $ 285 $ 4