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Commitments - Future minimum lease payments (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Oct. 01, 2019
Other Commitments [Line Items]      
Rent expense $ 5,143 $ 4,294  
Security deposits 477 $ 460  
Fiscal years ending February 28(29),      
2021 6,104    
2022 6,580    
2023 6,577    
2024 6,625    
2025 5,664    
Thereafter 21,516    
Total 53,066    
Seattle Lease      
Other Commitments [Line Items]      
Payments for termination of lease $ 142    
Fiscal years ending February 28(29),      
Total     $ 25,836