Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plans and Stock-Based Compensation - Stock Options (Details)

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Equity Incentive Plans and Stock-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Options            
Outstanding as of beginning of period (in shares) 11,394,000 15,389,000     13,152,000 16,960,000
Granted (in shares) 0 0        
Exercised (in shares) (1,614,000) (1,186,000)        
Forfeited or expired (in shares) (144,000) (385,000)        
Outstanding as of end of period (in shares) 11,394,000 15,389,000        
Options vested and expected to vest as of end of period (in shares) 11,394,000 15,389,000        
Vested and exercisable as of end of period (in shares) 10,897,000 10,800,000        
Weighted-Average Exercise Price            
Outstanding as of beginning of period (in dollars per share) $ 0.61 $ 0.54 $ 0.54      
Granted (in dollars per share) 0 0        
Exercised (in dollars per share) 0.18 0.26        
Forfeited or expired (in dollars per share) 0.81 0.63        
Outstanding as of end of period (in dollars per share) 0.67 0.56        
Options vested and expected to vest as of end of period (in dollars per share) 0.67 0.56        
Vested and exercisable as of end of period (in dollars per share) $ 0.68 $ 0.67        
Weighted-Average Remaining Contractual Term in years 5 years 10 months 24 days 7 years 6 years 2 months 12 days 7 years 3 months 18 days    
Additional Disclosures            
Aggregate intrinsic value of options outstanding $ 2.4       $ 2.3  
Aggregate intrinsic value of options exercised 0.2 $ 3.5        
Grant date fair value of options vested $ 0.1 $ 0.3