Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2014

Investments Debt And Equity Securities [Abstract]

Schedule of Investments

The table below summarizes the Company’s available-for-sale securities (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Estimated Fair Value
March 31, 2014
Cash equivalents:
Money market funds	$	7,234	$	—	$	—	$	7,234
Total		7,234		—		—		7,234
Available-for-sale securities:
U.S. government sponsored entity debt securities		116,970		21		—		116,991
Total cash equivalents and available-for-sale securities	$	124,204	$	21	$	—	$	124,225
December 31, 2013
Cash equivalents:
Money market funds		6,934		—		—		6,934
Total		6,934		—		—		6,934
Available-for-sale securities:
U.S. government sponsored entity debt securities		121,278		12		—		121,290
Total cash equivalents and available-for-sale securities	$	128,212	$	12	$	—	$	128,224