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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (235,329)	$ (90,733)	$ (159,457)
Other comprehensive income (loss):
Foreign currency translation adjustments	404	(1,452)	2,345
Marketable securities:
Unrealized gain (loss) on marketable securities	0	86	(103)
Reclassification to net income	0	0	(395)
Deferred tax asset / liability change	0	0	158
Unrealized gain (loss) on marketable securities, net of tax	0	86	(340)
Total other comprehensive income (loss)	404	(1,366)	2,005
Comprehensive loss	$ (234,925)	$ (92,099)	$ (157,452)

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