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Loss per share - Narrative (Details) - $ / shares	3 Months Ended		6 Months Ended
Loss per share - Narrative (Details) - $ / shares	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	May 28, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Maximum number of shares issuable if debt was converted (in shares)	9,277,305		9,277,305
Stock Compensation Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from calculation (in shares)	290,483	0	301,898	0
Convertible Debt Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from calculation (in shares)	3,364,297	0	1,691,442	0
Convertible Senior Notes \| 4% Convertible Senior Dotes due 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Initial conversion price					$ 22.3125