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Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Aggregate Intrinsic Value      
Issuance of shares of common stock $ 268 $ 1,018  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of options exercised $ 1,000 1,300  
Stock options activity      
Outstanding, beginning of period (in shares) 1,410,139    
Granted (in shares) 7,929    
Exercised (in shares) (12,943)    
Cancelled / Forfeited (in shares) (4,644)    
Outstanding, end of period (in shares) 1,400,481   1,410,139
Vested and exercisable, end of period (in shares) 1,012,572    
Vested and expected to vest, end of period (in shares) 1,357,921    
Weighted Average Exercise Price      
Outstanding, beginning of period (in dollars per share) $ 76.19    
Granted (in dollars per share) 105.42    
Exercised (in dollars per share) 24.38    
Cancelled / Forfeited (in dollars per share) 126.62    
Outstanding, end of period (in dollars per share) 76.65   $ 76.19
Vested and exercisable, end of period (in dollars per share) 62.08    
Vested and expected to vest, end of period (in dollars per share) $ 75.46    
Weighted Average Remaining Contractual Term      
Outstanding, end of period 6 years 3 months 7 days   6 years 8 months 1 day
Vested and exercisable, end of period 5 years 7 months 9 days    
Vested and expected to vest, end of period 6 years 2 months 15 days    
Aggregate Intrinsic Value      
Outstanding, end of period $ 71,762   $ 49,705
Vested and exercisable, end of period 65,829    
Vested and expected to vest, end of period 71,128    
Issuance of shares of common stock $ 300 $ 1,000