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Long-term debt (Details) - USD ($)
$ in Thousands
Apr. 30, 2020
Sep. 30, 2020
Future debt principal payments    
2020 (represents three remaining months)   $ 55
2021   333
2022   112
Total   500
Less current portion of long-term debt   (305)
Long-term debt, net of current portion   $ 195
Paycheck Protection Program    
Debt Instrument [Line Items]    
Debt amount $ 500  
Debt term (in Years) 2 years  
Interest rate 1.00%  
Payments deferred period 6 months