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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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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)