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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Common Stock, Beginning Balance (in shares) at Sep. 30, 2021 44,168,745 44,169,000        
Treasury Stock, Beginning Balance (in shares) at Sep. 30, 2021       (8,000)    
Beginning 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)   35,000        
Exercise of stock options 239   239      
Settlement of restricted stock units (in shares)   1,015,000        
Settlement of restricted stock units 0 $ 1 (1)      
Issuance of common stock under employee stock purchase plan (in shares)   71,000        
Issuance of common stock under employee stock purchase plan 923   923      
Stock-based compensation expense 10,117   10,117      
Repurchases and retirement of common stock (in shares)   (894,000)   8,000    
Repurchases and retirements of common stock (14,828) $ (1) (1) $ 140 (14,966)  
Components of other comprehensive income (loss):            
Net income (loss) 3,344       3,344  
Currency translation adjustment (16,724)         (16,724)
Change in unrealized gain (loss) on investments (189)         (189)
Other comprehensive income (loss) $ (13,569)          
Common Stock, Ending Balance (in shares) at Jun. 30, 2022 44,396,263 44,396,000        
Treasury Stock, Ending Balance (in shares) at Jun. 30, 2022       0    
Ending Balance at Jun. 30, 2022 $ 175,712 $ 44 211,212 $ 0 (17,688) (17,856)
Common Stock, Beginning Balance (in shares) at Mar. 31, 2022   44,344,000        
Beginning Balance at Mar. 31, 2022 184,892 $ 44 207,491   (17,473) (5,170)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   10,000        
Exercise of stock options 33   33      
Settlement of restricted stock units (in shares)   42,000        
Stock-based compensation expense 3,688   3,688      
Components of other comprehensive income (loss):            
Net income (loss) (215)       (215)  
Currency translation adjustment (13,595)         (13,595)
Change in unrealized gain (loss) on investments 909         909
Other comprehensive income (loss) $ (12,901)          
Common Stock, Ending Balance (in shares) at Jun. 30, 2022 44,396,263 44,396,000        
Treasury Stock, Ending Balance (in shares) at Jun. 30, 2022       0    
Ending Balance at Jun. 30, 2022 $ 175,712 $ 44 211,212 $ 0 (17,688) (17,856)
Common Stock, Beginning Balance (in shares) at Sep. 30, 2022 44,680,429 44,680,000        
Beginning Balance at Sep. 30, 2022 $ 170,317 $ 44 216,493   (18,001) (28,219)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares) 97,802 99,000        
Exercise of stock options $ 732   732      
Settlement of restricted stock units (in shares)   656,000        
Settlement of restricted stock units 0 $ 1 (1)      
Issuance of common stock under employee stock purchase plan (in shares)   72,000        
Issuance of common stock under employee stock purchase plan 619   619      
Stock-based compensation expense 7,790   7,790      
Components of other comprehensive income (loss):            
Net income (loss) 9,471       9,471  
Currency translation adjustment 17,944         17,944
Change in unrealized gain (loss) on investments 771         771
Other comprehensive income (loss) $ 28,186          
Common Stock, Ending Balance (in shares) at Jun. 30, 2023 45,507,401 45,507,000        
Ending Balance at Jun. 30, 2023 $ 207,644 $ 45 225,633   (8,530) (9,504)
Common Stock, Beginning Balance (in shares) at Mar. 31, 2023   45,410,000        
Beginning Balance at Mar. 31, 2023 203,030 $ 45 222,933   (8,102) (11,846)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   13,000        
Exercise of stock options 56   56      
Settlement of restricted stock units (in shares)   84,000        
Stock-based compensation expense 2,644   2,644      
Components of other comprehensive income (loss):            
Net income (loss) (428)       (428)  
Currency translation adjustment 2,219         2,219
Change in unrealized gain (loss) on investments 123         123
Other comprehensive income (loss) $ 1,914          
Common Stock, Ending Balance (in shares) at Jun. 30, 2023 45,507,401 45,507,000        
Ending Balance at Jun. 30, 2023 $ 207,644 $ 45 $ 225,633   $ (8,530) $ (9,504)