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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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