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Summary of significant accounting policies - Adoption of ASU 2020-06 (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stockholders equity	$ (347,086)	$ 1,438	$ 481,982	$ 594,330
Long-term debt	571,722	281,894
Deferred tax valuation allowance	672,172	525,570
Cumulative Effect Adjustment
Stockholders equity			(120,440)
Additional paid-in capital
Stockholders equity	2,305,020	2,123,606	2,171,746	1,795,351
Additional paid-in capital | Cumulative Effect Adjustment
Stockholders equity			(175,236)
Accumulated deficit
Stockholders equity	$ (2,656,974)	$ (2,097,957)	(1,628,877)	$ (1,190,499)
Accumulated deficit | Cumulative Effect Adjustment
Stockholders equity			$ 54,796

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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