v3.21.1

Summary of significant accounting policies - Basis of presentation (Details) - USD ($) $ in Thousands | Jan. 01, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Adoption of ASC 606 |  |  |
Accumulated deficit |  | $ (157,944) | $ (158,066)
Property and equipment, net | $ 400,252 | 404,683 | 406,328
Long-term debt | 198,974 | 199,086 | 171,695
Additional paid-in capital | 201,947 | 203,900 | $ 241,868
Adoption of ASC 842 |  |  |
Operating lease right-of-use liabilities |  | $ 16,398 |
Income Tax Benefit Related to Equity Component of Convertible Notes [Member] |  |  |
Adoption of ASC 606 |  |  |
Tax benefit related to the equity component of the Convertible Notes that was recorded as additional paid-in capital | 5,686 |  |
Accounting Standards Update 2020-06 [Member] |  |  |
Adoption of ASC 606 |  |  |
Accumulated deficit | 6,566 |  |
Gross deferred tax liabilities | (27,949) |  |
Accounting Standards Update 2020-06 [Member] | Previously Reported [Member] |  |  |
Adoption of ASC 606 |  |  |
Property and equipment, net | 406,328 |  |
Long-term debt | 171,695 |  |
Additional paid-in capital | 241,868 |  |
Accounting Standards Update 2020-06 [Member] | Adjustment for Adoption |  |  |
Adoption of ASC 606 |  |  |
Property and equipment, net | (6,076) |  |
Long-term debt | 27,279 |  |
Additional paid-in capital | $ (39,921) |  |

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