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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Paid-in Capital
Accumulated Deficit
Beginning balance (in shares) at Sep. 30, 2019   30,933    
Beginning balance at Sep. 30, 2019 $ 538,754 $ 31 $ 854,275 $ (315,552)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income (loss) 2,746     2,746
Stock-based compensation expense 2,311   2,311  
Exercises of stock options (in shares)   47    
Exercises of stock options 173   173  
Shares issued under employee stock plans, net (in shares)   574    
Forfeiture and other settlements of restricted stock (in shares)   (1)    
Forfeiture and other settlements of restricted stock (2,058)   (2,058)  
Common stock redeemed for tax liability (in shares)   (170)    
Common stock redeemed for tax liability (2,646)   (2,646)  
Ending balance (in shares) at Dec. 31, 2019   31,383    
Ending balance at Dec. 31, 2019 539,280 $ 31 852,055 (312,806)
Beginning balance (in shares) at Sep. 30, 2020   31,012    
Beginning balance at Sep. 30, 2020 593,171 $ 31 856,466 (263,326)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income and comprehensive income (loss) 11,997     11,997
Stock-based compensation expense 3,511   3,511  
Exercises of stock options (in shares)   117    
Exercises of stock options 3   3  
Shares issued under employee stock plans, net (in shares)   411    
Common stock redeemed for tax liability (in shares)   (286)    
Common stock redeemed for tax liability (2,620)   (2,620)  
Ending balance (in shares) at Dec. 31, 2020   31,254    
Ending balance at Dec. 31, 2020 $ 606,062 $ 31 $ 857,360 $ (251,329)