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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (63,828)	$ (39,714)	$ (45,562)
Other comprehensive loss:
Foreign currency translation adjustments	(776)	968	(172)
Changes in unrealized gain (loss) on investments, net of income taxes of $0 in 2018, $0 in 2017, and $71 in 2016.	110	(161)	113
Comprehensive loss	$ (64,494)	$ (38,907)	$ (45,621)

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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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