Cash, Cash Equivalents and Marketable Investments (Tables)

3 Months Ended

Mar. 31, 2014

Cash, Cash Equivalents and Marketable Investments [Abstract]

Unrealized gains and losses related to marketable investments and long-term investments

The following tables summarize unrealized gains and losses related to the Company’s marketable investments, designated as available-for-sale (in thousands):

March 31, 2014	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Cash and cash equivalents:
Cash	$	2,757	$	—	$	—		$	2,757
Money market funds		5,736		—		—			5,736
Commercial paper		2,250		—		—			2,250
Total cash and cash equivalents		10,743		—		—			10,743
Marketable investments:
U.S. government notes		17,107		14		(9	)		17,112
U.S. government agencies		21,088		39		(1	)		21,126
Municipal securities		2,042		4		—			2,046
Commercial paper		14,885		5		—			14,890
Corporate debt securities		17,854		57		(6	)		17,905
Total marketable investments		72,976		119		(16	)		73,079
Total cash, cash equivalents and marketable investments	$	83,719	$	119	$	(16	)	$	83,822

December 31, 2013	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Cash and cash equivalents:
Cash	$	3,816	$	—	$	—		$	3,816
Money market funds		9,926		—		—			9,926
Commercial paper		2,500		—		—			2,500
Total cash and cash equivalents		16,242		—		—			16,242
Marketable investments:
U.S. government notes		10,516		11		(5	)		10,522
U.S. government agencies		25,823		38		(3	)		25,858
Municipal securities		2,043		1		(5	)		2,039
Commercial paper		10,239		3		—			10,242
Corporate debt securities		18,109		61		—			18,170
Total marketable investments		66,730		114		(13	)		66,831
Total cash, cash equivalents and marketable investments	$	82,972	$	114	$	(13	)	$	83,073

Estimated fair value of marketable investments and long-term investments classified by contractual maturity date

The following table summarizes the contractual maturities of the Company’s available-for-sale securities, classified as marketable investments as of March 31, 2014 (in thousands):

	Amount
Due in less than one year	$	35,678
Due in 1 to 3 years		37,401
	$	73,079