Accounts payable and other noncurrent liabilities - Narrative (Details) $ in Millions	Mar. 31, 2021 USD ($) item	Feb. 28, 2021 USD ($) item
Vendor Agreement
Accounts payable and other noncurrent liabilities
Payable to vendor | $	$ 8.1
Imputed interest rate	5.00%
Number of vendor agreements | item	2
Percentage of Accounts Payable and Noncurrent Liabilities	53.00%
Vendor Agreement One
Accounts payable and other noncurrent liabilities
Payable to vendor | $		$ 1.5
Number of payments to be made | item		5
Vendor Agreement Two
Accounts payable and other noncurrent liabilities
Payable to vendor | $		$ 7.2
Number of payments to be made | item		6