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Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	6. Income Taxes The provisions for income taxes for the three and nine months ended September 30, 2017 were due to foreign taxes. The provision for income taxes for the three months ended September 30, 2016 was due to the discrete tax effect arising from an unrealized loss in other comprehensive income (loss) related to available-for-sale securities, and foreign taxes. The benefit from income taxes for the nine months ended September 30, 2016 was due to the discrete tax effect arising from cumulative unrealized gains in other comprehensive income (loss) related to available-for-sale securities, partially offset by foreign taxes. Based upon the weight of available evidence, which includes its historical operating performance, reported cumulative net losses since inception and expected continuing net loss, the Company has established and continues to maintain a full valuation allowance against its deferred tax assets as it does not currently believe that realization of those assets is more likely than not.

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- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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