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Summary of significant accounting policies - Adoption of ASU 2020-06 (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Stockholders equity	$ 292,576	$ 481,982	$ 528,734	$ 594,330
Long-term debt	430,038	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	2,033,972	2,171,746	1,834,061	1,795,351
Additional paid-in capital | Cumulative Effect Adjustment
Stockholders equity		(175,236)
Accumulated deficit
Stockholders equity	$ (1,702,723)	(1,628,877)	$ (1,303,404)	$ (1,190,499)
Accumulated deficit | Cumulative Effect Adjustment
Stockholders equity		$ 54,796

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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