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Cash, Cash Equivalents and Available for Sale Securities (Tables)

12 Months Ended

Dec. 31, 2014

Cash, Cash Equivalents and Available for Sale Securities

Summary of available for sale securities, including carrying value and estimated fair values

	As of December 31, 2014
	Cost		Fair Value		Carrying Value		Unrealized Loss
U.S. Treasury securities—maturities < 1 year	$	423,859	$	423,746	$	423,746	$	(113	)
U.S. Treasury securities—maturities > 1 year	$	—	$	—	$	—	$	—

Total	$	423,859	$	423,746	$	423,746	$	(113	)

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details