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Stock-Based Compensation - Narrative (Details) - $ / shares
3 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jan. 22, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares of common stock authorized (in shares)     9,000,000
Shares available for future grants (in shares) 11,400,000    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards earned percentage 200.00%