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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	$ (130,075)	$ (76,810)	$ (35,252)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	194	220	(1,940)
Unrealized gain on available-for-sale marketable securities, net of reclassification adjustments for realized amounts	590	45	146
Employee retirement benefits	(1,960)	369	(578)
Other comprehensive (loss) income, net of tax	(1,176)	634	(2,372)
Comprehensive loss, net of tax	$ (131,251)	$ (76,176)	$ (37,624)

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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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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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