Quarterly report pursuant to Section 13 or 15(d)

Nature of business and summary of significant accounting policies (Details)

v3.21.2
Nature of business and summary of significant accounting policies (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jul. 01, 2021
$ / shares
shares
Jun. 29, 2021
shares
Jun. 28, 2021
shares
May 28, 2021
Jul. 01, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Subsidiary, Sale of Stock [Line Items]              
Reverse stock split ratio       0.1667      
Stock issued in lieu of fractional shares, reverse stock split     1,081        
Offering costs | $           $ 19 $ 0
Redeemable Convertible Preferred Stock              
Subsidiary, Sale of Stock [Line Items]              
Shares issued upon conversion of notes (in shares)   4,732,420          
IPO              
Subsidiary, Sale of Stock [Line Items]              
Offering costs | $           $ 900  
Subsequent events | IPO              
Subsidiary, Sale of Stock [Line Items]              
Number of shares sold 8,000,000            
Offering price (in dollars per share) | $ / shares $ 5.00       $ 5.00    
Total net proceeds | $         $ 36,200    
Underwriting discounts and commissions | $         2,800    
Offering costs | $         $ 1,000    
Shares issued upon conversion of preferred stock (in shares) 5,764,533       5,764,533    
Subsequent events | Underwriters option              
Subsidiary, Sale of Stock [Line Items]              
Number of shares sold 0            
Underwriters option, term 30 days            
Stock issuable (in shares) 1,200,000            
Maximum              
Subsidiary, Sale of Stock [Line Items]              
Reverse stock split ratio       0.3333      
Minimum              
Subsidiary, Sale of Stock [Line Items]              
Reverse stock split ratio       0.10