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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (60,585)	$ (62,906)	$ (55,868)
Other comprehensive (loss) income:
Unrealized (losses) gains on available-for-sale investments, net of taxes of zero, zero and $3,825 for 2017, 2016, and 2015, respectively	(200)	(7,186)	7,320
Comprehensive loss	$ (60,785)	$ (70,092)	$ (48,548)

X

- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Name Accounting Standards Codification
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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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