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The Company (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2019	Aug. 31, 2015
Long-term debt
Retained earnings (accumulated deficit)	$ (1,702,723)	$ (1,628,877)
Convertible debt | 1.50% Convertible senior notes due 2026
Long-term debt
Interest rate ( as a percent )	1.50%		1.50%
Convertible debt | 3.00% Convertible senior notes due 2022
Long-term debt
Interest rate ( as a percent )				3.00%

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