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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Income Statement (Details) - USD ($)
 3 Months Ended
Aug. 28, 2022
Aug. 29, 2021
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Product sales $ 43,355,000 $ 41,632,000
Cost of product sales 37,103,000 31,197,000
Gross profit 6,252,000 10,435,000
Operating costs and expenses:    
Research and development 2,048,000 1,873,000
Selling, general and administrative 10,661,000 9,470,000
Restructuring costs 1,047,000 1,834,000
Total operating costs and expenses 13,756,000 13,177,000
Operating loss (7,504,000) (2,742,000)
Interest income 15,000 27,000
Interest expense (3,678,000) (6,678,000)
Other income (expense), net (180,000) 109,000
Net loss before tax (11,347,000) (9,284,000)
Income tax (expense) benefit (4,000.0) 1,651,000
Net loss from continuing operations (11,351,000) (7,633,000)
Loss from discontinued operations, net of tax 0 (1,844,000)
Net loss $ (11,351,000) $ (9,477,000)
Basic net loss per share:    
Loss from continuing operations - basic (in dollars per share) $ (0.38) $ (0.26)
Loss from discontinued operations- basic (in dollars per share) 0 (0.06)
Total basic net loss per share (in dollars per share) (0.38) (0.32)
Diluted net loss per share:    
Loss from continuing operations - diluted (in dollars per share) (0.38) (0.26)
Loss from discontinued operations- diluted (in dollars per share) 0 (0.06)
Total diluted net loss per share (in dollars per share) $ (0.38) $ (0.32)
Total comprehensive loss $ (11,051,000) $ (9,111,000)
As reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Product sales 43,355,000  
Cost of product sales 37,534,000  
Gross profit 5,821,000  
Operating costs and expenses:    
Research and development 2,048,000  
Selling, general and administrative 10,883,000  
Restructuring costs 1,047,000  
Total operating costs and expenses 13,978,000  
Operating loss (8,157,000)  
Interest income 15,000  
Interest expense (3,678,000)  
Other income (expense), net (180,000)  
Net loss before tax (12,000,000)  
Income tax (expense) benefit (64,000)  
Net loss from continuing operations (12,064,000)  
Loss from discontinued operations, net of tax 0  
Net loss $ (12,064,000)  
Basic net loss per share:    
Loss from continuing operations - basic (in dollars per share) $ (0.41)  
Loss from discontinued operations- basic (in dollars per share) 0  
Total basic net loss per share (in dollars per share) (0.41)  
Diluted net loss per share:    
Loss from continuing operations - diluted (in dollars per share) (0.41)  
Loss from discontinued operations- diluted (in dollars per share) 0  
Total diluted net loss per share (in dollars per share) $ (0.41)  
Total comprehensive loss $ (11,764,000)  
Adjustment    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Product sales 0  
Cost of product sales (431,000)  
Gross profit 431,000  
Operating costs and expenses:    
Research and development 0  
Selling, general and administrative (222,000)  
Restructuring costs 0  
Total operating costs and expenses (222,000)  
Operating loss 653,000  
Interest income 0  
Interest expense 0  
Other income (expense), net 0  
Net loss before tax 653,000  
Income tax (expense) benefit 60,000  
Net loss from continuing operations 713,000  
Loss from discontinued operations, net of tax 0  
Net loss $ 713,000  
Basic net loss per share:    
Loss from continuing operations - basic (in dollars per share) $ 0.03  
Loss from discontinued operations- basic (in dollars per share) 0  
Total basic net loss per share (in dollars per share) 0.03  
Diluted net loss per share:    
Loss from continuing operations - diluted (in dollars per share) 0.03  
Loss from discontinued operations- diluted (in dollars per share) 0  
Total diluted net loss per share (in dollars per share) $ 0.03  
Total comprehensive loss $ 713,000