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Debt - Summary of convertible notes (Details) - Convertible debt - USD ($)	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Aug. 31, 2015
Convertible Senior Notes, 1.5%, Due September 15, 2026
Long-term debt
Principal	$ 287,500,000	$ 287,500,000
Less: Debt issuance costs	(4,567,000)
Less: Debt discount, net	(119,350,000)
Net carrying amount	163,583,000
3.00% Convertible senior notes due 2022
Long-term debt
Principal	150,000,000		$ 150,000,000	$ 150,000,000.0
Less: Debt issuance costs	(1,329,000)		(1,746,000)
Less: Debt discount, net	(26,686,000)		(35,054,000)
Net carrying amount	$ 121,985,000		$ 113,200,000

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