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Cash and Cash Equivalents and Investments (Details 1) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents
Fair Value
Amortized Cost	$ 9,744	$ 137,266
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	9,744	137,266
Certificates of Deposit
Fair Value
Amortized Cost	553	552
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	553	552
U.S. Treasury Securities
Fair Value
Amortized Cost	272,088	201,584
Gross Unrealized Gains	1,241	3
Gross Unrealized Losses	(1,143)	(66)
Estimated Fair Value	272,186	201,521
Total Short-term Investments
Fair Value
Amortized Cost	272,641	202,136
Gross Unrealized Gains	1,241	3
Gross Unrealized Losses	(1,143)	(66)
Estimated Fair Value	272,739	202,073
Total Cash and Cash Equivalents and Investments
Fair Value
Amortized Cost	282,385	339,402
Gross Unrealized Gains	1,241	3
Gross Unrealized Losses	(1,143)	(66)
Estimated Fair Value	$ 282,483	$ 339,339

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (b)



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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB



-Name Accounting Standards Codification



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