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Summary of significant accounting policies - Adoption of ASU 2020-06 (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Stockholders equity | $ 196,577 | $ 292,576 | $ 481,982 | $ 572,494 | $ 528,734 | $ 594,330
Long-term debt | 430,496 |  | 309,145 |  |  |
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 | 2,063,687 | 2,033,972 | 2,171,746 | 2,067,274 | 1,834,061 | 1,795,351
Additional paid-in capital | Cumulative Effect Adjustment |  |  |  |  |  |
Stockholders equity |  |  | (175,236) |  |  |
Accumulated deficit |  |  |  |  |  |
Stockholders equity | $ (1,821,093) | $ (1,702,723) | (1,628,877) | $ (1,484,831) | $ (1,303,404) | $ (1,190,499)
Accumulated deficit | Cumulative Effect Adjustment |  |  |  |  |  |
Stockholders equity |  |  | $ 54,796 |  |  |

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