Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2014

Investments Debt And Equity Securities [Abstract]

Summary of Available for Sale Securities Held

The following table summarizes the available-for-sale securities held at September 30, 2014:

Description	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
September 30, 2014
U.S. government agency securities	$	161,652	$	3	$	(48	)	$	161,607
Certificates of deposit		12,639		—		(29	)		12,610
Total	$	174,291	$	3	$	(77	)	$	174,217

- 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.

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