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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (41,789)	$ (9,520)	$ (113,902)	$ (28,782)
Other comprehensive income (loss):
Unrealized gain (loss) on marketable securities	839	40	898	(83)
Foreign currency translation gain (loss)	278	(3,138)	(438)	(2,031)
Comprehensive loss	$ (40,672)	$ (12,618)	$ (113,442)	$ (30,896)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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