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-Publisher FASB
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Loss per share - Narrative (Details) - $ / shares	3 Months Ended
Loss per share - Narrative (Details) - $ / shares	Mar. 31, 2020	Mar. 31, 2019	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
Stock Compensation Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from calculation (in shares)	443,168	321,619
Convertible Debt Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from calculation (in shares)	9,277,305	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