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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Sep. 30, 2020   41,780,000        
Beginning balance at Sep. 30, 2020 $ 132,243 $ 42 $ 146,518 $ 0 $ (13,994) $ (323)
Treasury Stock, Beginning Balance (in shares) at Sep. 30, 2020       0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares) 329,878 330,000        
Exercise of stock options $ 2,516   2,516      
Settlement of restricted stock units (in shares)   1,066,000        
Settlement of restricted stock units 0 $ 1 (1)      
Issuance of common stock under employee stock purchase plan (in shares)   129,000        
Issuance of common stock under employee stock purchase plan 1,519   1,519      
Acquisition-related shares issued (in shares)   867,000        
Acquisition-related shares issued 13,943 $ 1 13,942      
Stock-based compensation expense 11,532   11,532      
Sale of convertible senior notes warrants 23,909   23,909      
Repurchase and retirements of common stock (in shares)   (3,000)   (8,000)    
Repurchases and retirements of common stock (190)     $ (140) (50)  
Components of comprehensive income (loss)            
Net income 7,978       7,978  
Currency translation adjustment (455)         (455)
Change in unrealized gain (loss) on investments (165)         (165)
Total comprehensive income (loss) 7,358          
Ending balance (in shares) at Sep. 30, 2021   44,169,000        
Treasury Stock, Ending Balance (in shares) at Sep. 30, 2021       (8,000)    
Ending balance at Sep. 30, 2021 $ 192,830 $ 44 199,935 $ (140) (6,066) (943)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares) 35,625 35,000        
Exercise of stock options $ 238   238      
Settlement of restricted stock units (in shares)   1,075,000        
Settlement of restricted stock units 0 $ 1 (1)      
Issuance of common stock under employee stock purchase plan (in shares)   129,000        
Issuance of common stock under employee stock purchase plan 1,487   1,487      
Acquisition-related shares issued (in shares)   203,000        
Acquisition-related shares issued 1,836   1,836      
Stock-based compensation expense 13,346   13,346      
Repurchase and retirements of common stock (in shares)   (931,000)   8,000    
Repurchases and retirements of common stock (15,176) $ 1 348 $ 140 (14,967)  
Components of comprehensive income (loss)            
Net income 3,694       3,694  
Currency translation adjustment (27,559)         (27,559)
Change in unrealized gain (loss) on investments 283         283
Total comprehensive income (loss) $ (23,582)          
Ending balance (in shares) at Sep. 30, 2022 44,680,429 44,680,000        
Treasury Stock, Ending Balance (in shares) at Sep. 30, 2022       0    
Ending balance at Sep. 30, 2022 $ 170,979 $ 44 216,493 $ 0 (17,339) (28,219)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares) 98,952 100,000        
Exercise of stock options $ 727   727      
Settlement of restricted stock units (in shares)   689,000        
Settlement of restricted stock units 0 $ 2 (2)      
Issuance of common stock under employee stock purchase plan (in shares)   122,000        
Issuance of common stock under employee stock purchase plan 1,010   1,010      
Stock-based compensation expense 10,463   10,463      
Components of comprehensive income (loss)            
Net income 8,027       8,027  
Currency translation adjustment 13,093         13,093
Change in unrealized gain (loss) on investments 889         889
Total comprehensive income (loss) $ 22,009          
Ending balance (in shares) at Sep. 30, 2023 45,591,199 45,591,000        
Treasury Stock, Ending Balance (in shares) at Sep. 30, 2023       0    
Ending balance at Sep. 30, 2023 $ 205,188 $ 46 $ 228,691 $ 0 $ (9,312) $ (14,237)