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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Restricted stock units
Common Stock
Common Stock
Restricted stock units
Common Stock
Performance share units
Additional paid in capital
Additional paid in capital
Restricted stock units
Accumulated deficit
Accumulated other comprehensive income
Treasury Stock
Beginning Balance, Shares at May. 31, 2021     38,920,951,000              
Beginning Balance at May. 31, 2021 $ 439,457   $ 377     $ 573,507   $ (131,866) $ 3,153 $ (5,714)
Beginning Balance, Treasury Shares at May. 31, 2021                   (370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net loss (6,972)             (6,972)    
Exercise of stock options, Shares     80,635,000              
Exercise of stock options 1,280   $ 1     1,279        
Issuance/Cancellation of performance share units and restricted stock units, net, Shares       279,495,000 59,371,000          
Issuance/Cancellation of performance share units and restricted stock units   $ (1,734)         $ (1,734)      
Purchase of common stock under ESPP, Shares     49,789,000              
Purchases of common stock under ESPP 900   $ 1     899        
Stock-based compensation 2,429         2,429        
Other comprehensive loss, net of tax 590               590  
Ending Balance, Shares at Aug. 31, 2021     39,390,241,000              
Ending Balance at Aug. 31, 2021 435,950   $ 379     576,380   (138,838) 3,743 $ (5,714)
Ending Balance, Treasury Shares at Aug. 31, 2021                   (370,000,000)
Beginning Balance, Shares at May. 31, 2021     38,920,951,000              
Beginning Balance at May. 31, 2021 439,457   $ 377     573,507   (131,866) 3,153 $ (5,714)
Beginning Balance, Treasury Shares at May. 31, 2021                   (370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net loss (15,323)                  
Ending Balance, Shares at Nov. 30, 2021     39,455,193,000              
Ending Balance at Nov. 30, 2021 432,368   $ 379     580,330   (147,189) 4,562 $ (5,714)
Ending Balance, Treasury Shares at Nov. 30, 2021                   (370,000,000)
Beginning Balance, Shares at Aug. 31, 2021     39,390,241,000              
Beginning Balance at Aug. 31, 2021 435,950   $ 379     576,380   (138,838) 3,743 $ (5,714)
Beginning Balance, Treasury Shares at Aug. 31, 2021                   (370,000,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net loss (8,351)             (8,351)    
Exercise of stock options, Shares     56,064,000              
Exercise of stock options 1,022         1,022        
Issuance/Cancellation of performance share units and restricted stock units, net, Shares       8,695,000            
Issuance/Cancellation of performance share units and restricted stock units   (83)         (83)      
Purchase of common stock under ESPP, Shares     193,000              
Purchases of common stock under ESPP 3         3        
Stock-based compensation 3,008         3,008        
Other comprehensive loss, net of tax 819               819  
Ending Balance, Shares at Nov. 30, 2021     39,455,193,000              
Ending Balance at Nov. 30, 2021 $ 432,368   $ 379     580,330   (147,189) 4,562 $ (5,714)
Ending Balance, Treasury Shares at Nov. 30, 2021                   (370,000,000)
Beginning Balance, Shares at May. 31, 2022 39,171,173   39,541,173              
Beginning Balance at May. 31, 2022 $ 424,489   $ 380     586,879   (158,413) 1,357 $ (5,714)
Beginning Balance, Treasury Shares at May. 31, 2022                   (370,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net loss $ (21,490)                  
Ending Balance, Shares at Nov. 30, 2022 39,504,144   39,874,144              
Ending Balance at Nov. 30, 2022 $ 407,958   $ 381     593,482   (179,903) (288) $ (5,714)
Ending Balance, Treasury Shares at Nov. 30, 2022                   (370,000)
Beginning Balance, Shares at Aug. 31, 2022     39,847,751              
Beginning Balance at Aug. 31, 2022 414,041   $ 381     589,984   (171,417) 807 $ (5,714)
Beginning Balance, Treasury Shares at Aug. 31, 2022                   370,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Net loss (8,486)             (8,486)    
Exercise of stock options, Shares     15,000              
Exercise of stock options 184         184        
Issuance/Cancellation of performance share units and restricted stock units, net, Shares       11,393            
Issuance/Cancellation of performance share units and restricted stock units   $ (36)         $ (36)      
Stock-based compensation 3,350         3,350        
Other comprehensive loss, net of tax $ (1,095)               (1,095)  
Ending Balance, Shares at Nov. 30, 2022 39,504,144   39,874,144              
Ending Balance at Nov. 30, 2022 $ 407,958   $ 381     $ 593,482   $ (179,903) $ (288) $ (5,714)
Ending Balance, Treasury Shares at Nov. 30, 2022                   (370,000)