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Summary of significant accounting policies - Recent accounting pronouncements (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Recent accounting pronouncements
Accumulated deficit		$ 158,066	$ 140,973
Property and equipment, net	$ 406,328	406,328	380,243
Long-term debt	171,695	171,695	162,708
Income Tax Expense (Benefit)		157	(28)	$ (5,153)
Additional paid-in capital	241,868	241,868	234,638
Gross deferred tax liabilities		16,564	$ 19,651
Convertible Notes
Recent accounting pronouncements
Gross deferred tax liabilities		$ 27,949
ASU 2020-06 \| Cumulative effect of a change in accounting principle
Recent accounting pronouncements
Property and equipment, net	(6,076)
Long-term debt	27,279
Income Tax Expense (Benefit)	5,686
Additional paid-in capital	(39,921)
ASU 2020-06 \| Cumulative effect adjusted
Recent accounting pronouncements
Accumulated deficit	6,566
Property and equipment, net	400,252
Long-term debt	198,974
Additional paid-in capital	$ 201,947