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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Restricted stock units
Common Stock
Common Stock
Restricted stock units
Additional paid in capital
Additional paid in capital
Restricted stock units
Accumulated deficit
Accumulated other comprehensive income (loss)
Treasury Stock
Beginning Balance, Shares at May. 31, 2019     37,984,382            
Beginning Balance at May. 31, 2019 $ 614,815   $ 372   $ 555,040   $ 66,469 $ (1,352) $ (5,714)
Beginning Balance, Treasury Shares at May. 31, 2019                 (370,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (1,275)           (1,275)    
Exercise of stock options, Shares     48,136            
Exercise of stock options 531   $ 1   530        
Issuance/Cancellation of performance share units and restricted stock units, net, Shares       287,087          
Issuance/Cancellation of performance share units and restricted stock units   $ (2,459)       $ (2,459)      
Purchase of common stock under ESPP, Shares     40,270            
Purchases of common stock under ESPP 628       628        
Stock-based compensation 1,984       1,984        
Other comprehensive income, net of tax (151)             (151)  
Ending Balance, Shares at Aug. 31, 2019     38,359,875            
Ending Balance at Aug. 31, 2019 614,073   $ 373   555,723   65,194 (1,503) $ (5,714)
Ending Balance, Treasury Shares at Aug. 31, 2019                 (370,000)
Beginning Balance, Shares at May. 31, 2019     37,984,382            
Beginning Balance at May. 31, 2019 614,815   $ 372   555,040   66,469 (1,352) $ (5,714)
Beginning Balance, Treasury Shares at May. 31, 2019                 (370,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (9,720)                
Ending Balance, Shares at Feb. 29, 2020     38,434,757            
Ending Balance at Feb. 29, 2020 610,475   $ 374   560,330   56,749 (1,264) $ (5,714)
Ending Balance, Treasury Shares at Feb. 29, 2020                 (370,000)
Beginning Balance, Shares at Aug. 31, 2019     38,359,875            
Beginning Balance at Aug. 31, 2019 614,073   $ 373   555,723   65,194 (1,503) $ (5,714)
Beginning Balance, Treasury Shares at Aug. 31, 2019                 (370,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (2,736)           (2,736)    
Issuance/Cancellation of performance share units and restricted stock units, net, Shares       4,051          
Issuance/Cancellation of performance share units and restricted stock units   0              
Stock-based compensation 2,242       2,242        
Other comprehensive income, net of tax 231             231  
Ending Balance, Shares at Nov. 30, 2019     38,363,926            
Ending Balance at Nov. 30, 2019 613,810   $ 373   557,965   62,458 (1,272) $ (5,714)
Ending Balance, Treasury Shares at Nov. 30, 2019                 (370,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (5,709)           (5,709)    
Exercise of stock options, Shares     2,500            
Exercise of stock options 30   $ 1   30        
Issuance/Cancellation of performance share units and restricted stock units, net, Shares       8,034          
Issuance/Cancellation of performance share units and restricted stock units   (25)       (25)      
Purchase of common stock under ESPP, Shares     60,297            
Purchases of common stock under ESPP 589       588        
Stock-based compensation 1,772       1,772        
Other comprehensive income, net of tax 8             8  
Ending Balance, Shares at Feb. 29, 2020     38,434,757            
Ending Balance at Feb. 29, 2020 610,475   $ 374   560,330   56,749 (1,264) $ (5,714)
Ending Balance, Treasury Shares at Feb. 29, 2020                 (370,000)
Beginning Balance, Shares at May. 31, 2020     38,448,536,000            
Beginning Balance at May. 31, 2020 $ 454,872   $ 374   561,871   (100,318) (1,341) $ (5,714)
Beginning Balance, Treasury Shares at May. 31, 2020 (370,000)               (370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss $ (4,268)           (4,268)    
Issuance/Cancellation of performance share units and restricted stock units, net, Shares       164,946,000          
Issuance/Cancellation of performance share units and restricted stock units   (143)       (143)      
Purchase of common stock under ESPP, Shares     79,596,000            
Purchases of common stock under ESPP 634   $ 1   633        
Stock-based compensation 1,864       1,864        
Other comprehensive income, net of tax 2,095             2,095  
Ending Balance, Shares at Aug. 31, 2020     38,693,078,000            
Ending Balance at Aug. 31, 2020 455,054   $ 375   564,225   (104,586) 754 $ (5,714)
Ending Balance, Treasury Shares at Aug. 31, 2020                 (370,000,000)
Beginning Balance, Shares at May. 31, 2020     38,448,536,000            
Beginning Balance at May. 31, 2020 $ 454,872   $ 374   561,871   (100,318) (1,341) $ (5,714)
Beginning Balance, Treasury Shares at May. 31, 2020 (370,000)               (370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss $ (12,080)                
Ending Balance, Shares at Feb. 28, 2021     38,877,367,000            
Ending Balance at Feb. 28, 2021 $ 454,936   $ 377   570,725   (112,398) 1,946 $ (5,714)
Ending Balance, Treasury Shares at Feb. 28, 2021 (370,000)               (370,000,000)
Beginning Balance, Shares at Aug. 31, 2020     38,693,078,000            
Beginning Balance at Aug. 31, 2020 $ 455,054   $ 375   564,225   (104,586) 754 $ (5,714)
Beginning Balance, Treasury Shares at Aug. 31, 2020                 (370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (4,268)           (4,268)    
Issuance/Cancellation of performance share units and restricted stock units, net, Shares       8,952,000          
Issuance/Cancellation of performance share units and restricted stock units   (10)       (10)      
Stock-based compensation 2,387       2,387        
Other comprehensive income, net of tax 1,180             1,180  
Ending Balance, Shares at Nov. 30, 2020     38,702,030,000            
Ending Balance at Nov. 30, 2020 454,343   $ 375   566,602   (108,854) 1,934 $ (5,714)
Ending Balance, Treasury Shares at Nov. 30, 2020                 (370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net loss (3,544)           (3,544)    
Exercise of stock options, Shares     81,636,000            
Exercise of stock options 1,354   $ 1   1,353        
Issuance/Cancellation of performance share units and restricted stock units, net, Shares       9,103,000          
Issuance/Cancellation of performance share units and restricted stock units   $ (49)       $ (49)      
Purchase of common stock under ESPP, Shares     84,598,000            
Purchases of common stock under ESPP 673   $ 1   672        
Stock-based compensation 2,147       2,147        
Other comprehensive income, net of tax 12             12  
Ending Balance, Shares at Feb. 28, 2021     38,877,367,000            
Ending Balance at Feb. 28, 2021 $ 454,936   $ 377   $ 570,725   $ (112,398) $ 1,946 $ (5,714)
Ending Balance, Treasury Shares at Feb. 28, 2021 (370,000)               (370,000,000)