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Summary of significant accounting policies - Adoption of ASU 2020-06 (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Stockholders equity | $ 1,438 | $ 481,982 | $ 594,330 | $ 350,727
Long-term debt | 281,894 | 309,145 |  |
Deferred tax liability - convertible debt |  | 29,626 |  |
Deferred tax valuation allowance | 525,570 | 379,608 |  |
Cumulative Effect Adjustment |  |  |  |
Stockholders equity |  | (120,440) |  |
Long-term debt |  | 120,400 |  |
Deferred tax liability - convertible debt |  | (29,600) |  |
Deferred tax valuation allowance |  | 29,600 |  |
Additional paid-in capital |  |  |  |
Stockholders equity | 2,123,606 | 2,171,746 | 1,795,351 | 1,288,137
Additional paid-in capital | Cumulative Effect Adjustment |  |  |  |
Stockholders equity |  | (175,236) |  |
Accumulated deficit |  |  |  |
Stockholders equity | $ (2,097,957) | (1,628,877) | $ (1,190,499) | $ (938,923)
Accumulated deficit | Cumulative Effect Adjustment |  |  |  |
Stockholders equity |  | $ 54,796 |  |

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