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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Sep. 30, 2020   35,513 6,353      
Beginning balance at Sep. 30, 2020 $ 371,500 $ 355 $ (55,109) $ 279,741 $ 170,330 $ (23,817)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 2,621       2,621  
Other comprehensive income (loss) 1,605         1,605
Issuance of common stock, net of offering expenses 73,830 $ 40   73,790    
Issuance of common stock, net of offering expenses (in shares)   4,025        
Employee stock purchase plan issuances (in shares)     (43)      
Employee stock purchase plan issuances 619   $ 379 240    
Taxes paid for net share settlement of share-based payment awards (in shares)     103      
Taxes paid for net share settlement of share-based payment awards (1,865)   $ (1,865)      
Issuance of stock under stock award plans (in shares)   904        
Issuance of stock under stock award plans 6,620 $ 9   6,611    
Stock-based compensation expense 4,222     4,222    
Ending balance (in shares) at Mar. 31, 2021   40,442 6,413      
Ending balance at Mar. 31, 2021 459,152 $ 404 $ (56,595) 364,604 172,951 (22,212)
Beginning balance (in shares) at Dec. 31, 2020   36,090 6,412      
Beginning balance at Dec. 31, 2020 377,642 $ 361 $ (56,333) 285,536 170,023 (21,945)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 2,928       2,928  
Other comprehensive income (loss) (267)         (267)
Issuance of common stock, net of offering expenses 73,830 $ 40   73,790    
Issuance of common stock, net of offering expenses (in shares)   4,025        
Employee stock purchase plan issuances (in shares)     (18)      
Employee stock purchase plan issuances 285   $ 157 128    
Taxes paid for net share settlement of share-based payment awards (in shares)     19      
Taxes paid for net share settlement of share-based payment awards (419)   $ (419)      
Issuance of stock under stock award plans (in shares)   327        
Issuance of stock under stock award plans 2,676 $ 3   2,673    
Stock-based compensation expense 2,477     2,477    
Ending balance (in shares) at Mar. 31, 2021   40,442 6,413      
Ending balance at Mar. 31, 2021 459,152 $ 404 $ (56,595) 364,604 172,951 (22,212)
Beginning balance (in shares) at Sep. 30, 2021   40,653 6,391      
Beginning balance at Sep. 30, 2021 472,517 $ 407 $ (56,535) 370,699 180,692 (22,746)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 4,034       4,034  
Other comprehensive income (loss) (160)         (160)
Employee stock purchase plan issuances (in shares)     (37)      
Employee stock purchase plan issuances 671   $ 334 337    
Taxes paid for net share settlement of share-based payment awards (in shares)     93      
Taxes paid for net share settlement of share-based payment awards (6,408)   $ (2,109) (4,299)    
Issuance of stock under stock award plans (in shares)   872        
Issuance of stock under stock award plans 5,591 $ 8   5,583    
Stock-based compensation expense 4,259     4,259    
Ending balance (in shares) at Mar. 31, 2022   41,525 6,447      
Ending balance at Mar. 31, 2022 480,504 $ 415 $ (58,310) 376,579 184,726 (22,906)
Beginning balance (in shares) at Dec. 31, 2021   41,413 6,447      
Beginning balance at Dec. 31, 2021 474,032 $ 414 $ (58,100) 372,797 181,879 (22,958)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 2,847       2,847  
Other comprehensive income (loss) 52         52
Employee stock purchase plan issuances (in shares)     (19)      
Employee stock purchase plan issuances 350   $ 173 177    
Taxes paid for net share settlement of share-based payment awards (in shares)     19      
Taxes paid for net share settlement of share-based payment awards (383)   $ (383) 0    
Issuance of stock under stock award plans (in shares)   112        
Issuance of stock under stock award plans 1,364 $ 1   1,363    
Stock-based compensation expense 2,242     2,242    
Ending balance (in shares) at Mar. 31, 2022   41,525 6,447      
Ending balance at Mar. 31, 2022 $ 480,504 $ 415 $ (58,310) $ 376,579 $ 184,726 $ (22,906)