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Condensed Consolidated Statements of Stockholders' Equity Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative-effect adjustment from adoption of ASU 2016-09 | ASU 2016-09 $ 19     $ 52 $ (33) [1]  
Beginning balance (in shares) at Sep. 30, 2017   33,008 6,437      
Beginning balance at Sep. 30, 2017 319,029 $ 330 $ (54,533) 245,528 150,363 [1] $ (22,659)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) [1] (4,487)       (4,487)  
Other comprehensive income (loss) 253 [1]         253
Employee stock purchase issuances (in shares)     (46)      
Employee stock purchase issuances 380   $ 389 (9)    
Repurchase of common stock (in shares)     64      
Repurchase of common stock (636)   $ (636)      
Issuance of stock under stock award plans (in shares)   473        
Issuance of stock under stock award plans 2,972 $ 5   2,967    
Stock-based compensation expense 1,053     1,053    
Ending balance (in shares) at Dec. 31, 2017   33,481 6,455      
Ending balance at Dec. 31, 2017 318,583 $ 335 $ (54,780) 249,591 145,843 [1] (22,406)
Beginning balance (in shares) at Sep. 30, 2018   33,813 6,385      
Beginning balance at Sep. 30, 2018 330,493 [1] $ 338 $ (54,216) 255,936 151,961 [1] (23,526)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 4,682       4,682 [1]  
Other comprehensive income (loss) (1,566)         (1,566)
Employee stock purchase issuances (in shares)     (33)      
Employee stock purchase issuances 289   $ 288 1    
Repurchase of common stock (in shares)     84      
Repurchase of common stock (964)   $ (964)      
Issuance of stock under stock award plans (in shares)   263        
Issuance of stock under stock award plans 662 $ 3   659    
Stock-based compensation expense 1,414     1,414    
Ending balance (in shares) at Dec. 31, 2018   34,076 6,436      
Ending balance at Dec. 31, 2018 $ 335,010 $ 341 $ (54,892) $ 258,010 $ 156,643 [1] $ (25,092)
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.