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Stock-based compensation - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jun. 02, 2020
Jun. 30, 2019
2020 Equity incentive plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued under the 2020 plan (in shares)         1,921,414  
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense   $ 0.2        
RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense   $ 13.3        
Shares vested (in shares)   199,394        
Awards granted in the period (in shares)   6,950        
Shares outstanding (in shares)   3,365,349   3,621,681    
Market-based RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate grants awarded (in shares)   705,000        
Shares outstanding   305,250        
Shares vested (in shares)   303,250        
Shares canceled (in shares)   96,500        
Unrecognized share based compensation   $ 0.7        
Performance-based RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted in the period (in shares) 90,400          
Revenue over four fiscal quarters $ 425.0          
SAUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted in the period (in shares)   0 0      
Shares outstanding (in shares)   150,000   150,000    
SAU-related liabilities   $ 1.1   $ 0.7    
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense   $ 0.4        
Awards granted in the period (in shares)   0        
Number of shares authorized for issuance (in shares)           1,500,000
Inventories            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation capitalized   $ 0.4   $ 0.3