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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (17,083)	$ (18,166)	$ (35,681)	$ (35,029)
Other comprehensive gains (losses):
Unrealized gains (losses) on available-for-sale investments, net of taxes of zero and $(205) for the three months ended June 30, 2017 and 2016, respectively, and zero and $(2,263) for the six months ended June 30, 2017 and 2016, respectively	124	(389)	(122)	(4,311)
Comprehensive loss	$ (16,959)	$ (18,555)	$ (35,803)	$ (39,340)

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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