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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - 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)   25,000        
Exercise of stock options 206   206      
Settlement of restricted stock units (in shares)   973,000        
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 6,429   6,429      
Repurchases and retirement of common stock (in shares)   (894,000)   8,000    
Repurchases and retirement of common stock (14,828) $ (1) (1) $ 140 (14,966)  
Components of other comprehensive income (loss):            
Net income 3,559       3,559  
Currency translation adjustment (3,129)         (3,129)
Change in unrealized gain (loss) on investments (1,098)         (1,098)
Other comprehensive income (loss) (668)          
Common Stock, Ending Balance (in shares) at Mar. 31, 2022   44,344,000        
Treasury Stock, Ending Balance (in shares) at Mar. 31, 2022       0    
Ending Balance at Mar. 31, 2022 184,892 $ 44 207,491 $ 0 (17,473) (5,170)
Common Stock, Beginning Balance (in shares) at Dec. 31, 2021   44,297,000        
Beginning Balance at Dec. 31, 2021 187,429 $ 44 203,091   (13,226) (2,480)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   16,000        
Exercise of stock options 179   179      
Settlement of restricted stock units (in shares)   248,000        
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 3,298   3,298      
Repurchases and retirement of common stock (in shares)   (288,000)        
Repurchases and retirement of common stock (4,682)       (4,682)  
Components of other comprehensive income (loss):            
Net income 435       435  
Currency translation adjustment (1,862)         (1,862)
Change in unrealized gain (loss) on investments (828)         (828)
Other comprehensive income (loss) (2,255)          
Common Stock, Ending Balance (in shares) at Mar. 31, 2022   44,344,000        
Treasury Stock, Ending Balance (in shares) at Mar. 31, 2022       0    
Ending Balance at Mar. 31, 2022 $ 184,892 $ 44 207,491 $ 0 (17,473) (5,170)
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) 85,302 86,000        
Exercise of stock options $ 676   676      
Settlement of restricted stock units (in shares)   572,000        
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 619   619      
Stock-based compensation expense 5,146   5,146      
Components of other comprehensive income (loss):            
Net income 9,899       9,899  
Currency translation adjustment 15,725         15,725
Change in unrealized gain (loss) on investments 648         648
Other comprehensive income (loss) $ 26,272          
Common Stock, Ending Balance (in shares) at Mar. 31, 2023 45,409,185 45,409,000        
Ending Balance at Mar. 31, 2023 $ 203,030 $ 45 222,933   (8,102) (11,846)
Common Stock, Beginning Balance (in shares) at Dec. 31, 2022   45,249,000        
Beginning Balance at Dec. 31, 2022 191,206 $ 45 219,596   (13,271) (15,164)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options (in shares)   3,000        
Exercise of stock options 14   14      
Settlement of restricted stock units (in shares)   86,000        
Issuance of common stock under employee stock purchase plan (in shares)   71,000        
Issuance of common stock under employee stock purchase plan 619   619      
Stock-based compensation expense 2,704   2,704      
Components of other comprehensive income (loss):            
Net income 5,169       5,169  
Currency translation adjustment 3,022         3,022
Change in unrealized gain (loss) on investments 296         296
Other comprehensive income (loss) $ 8,487          
Common Stock, Ending Balance (in shares) at Mar. 31, 2023 45,409,185 45,409,000        
Ending Balance at Mar. 31, 2023 $ 203,030 $ 45 $ 222,933   $ (8,102) $ (11,846)