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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Balance (in shares) at Sep. 30, 2016   30,742,662      
Balance at Sep. 30, 2016 $ 162,611 $ 29 $ 220,192 $ (8,571) $ (49,039)
Increase (Decrease) in Stockholders' Equity          
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units (in shares)   760,687      
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units         93   93    
Compensation expense and incremental tax benefit from grants of common stock options and restricted stock 6,979   6,979    
Net loss (39,187)       (39,187)
Defined benefit pension plan—unrecognized amounts, net of taxes 1,589     1,589  
Foreign currency translation 551     551  
Balance (in shares) at Sep. 30, 2017   31,503,349      
Balance at Sep. 30, 2017 132,636 $ 29 227,264 (6,431) (88,226)
Increase (Decrease) in Stockholders' Equity          
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units (in shares)   973,755      
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units         404 $ 1 403    
Compensation expense and incremental tax benefit from grants of common stock options and restricted stock 6,346   6,346    
Net loss (11,615)       (11,615)
Defined benefit pension plan—unrecognized amounts, net of taxes 773     773  
Foreign currency translation (791)        
Foreign currency translation and other (788)     (791) 3
Issuance of common stock for acquisition activity (in shares)   297,014      
Issuance of common stock for acquisition activity 2,005 $ 3 2,002    
Balance (in shares) at Sep. 30, 2018   32,774,118      
Balance at Sep. 30, 2018 129,654 $ 33 236,115 (6,449) (100,045)
Increase (Decrease) in Stockholders' Equity          
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units (in shares)   953,066      
Exercise of common stock options, grants of restricted stock awards, and vesting of restricted stock units         590 $ 1 589    
Net loss (19,260)       (19,260)
Defined benefit pension plan—unrecognized amounts, net of taxes (540)     (540)  
Foreign currency translation (984)        
Foreign currency translation and other (981)     (984) 3
Tax settlements associated with stock compensation expense (in shares)   (6,906)      
Tax settlements associated with stock compensation expense (44)   (44)    
Forfeiture of restricted stock awards (in shares)   (33,163)      
Forfeiture of restricted stock awards 0        
Stock compensation expense 6,026   6,026    
Balance (in shares) at Sep. 30, 2019   33,687,115      
Balance at Sep. 30, 2019 $ 116,175 $ 34 $ 242,686 $ (7,973) $ (118,572)