Available for Sale Securities

12 Months Ended

Dec. 31, 2015

Investments Debt And Equity Securities [Abstract]

Available for Sale Securities

3. Available for sale securities

Available for sale securities at December 31, 2015 and 2014 consist of the following:

			Gross		Gross
			Unrealized		Unrealized
	Amortized Cost		Gains		Losses			Fair Value
	(in thousands)
December 31, 2015
Cash and cash equivalents	$	49,778	$	—	$	—		$	49,778
Available for sale securities:
Certificates of deposit	$	21,505	—		—			$	21,505
U.S. Government debt securities		46,461	—			(185	)		46,276
Corporate debt securities		20,944		1		(50	)		20,895
Total available for sale securities	$	88,910	$	1	$	(235	)	$	88,676
Total cash, cash equivalents, and available for sale securities	$	138,688	$	1	$	(235	)	$	138,454

The estimated fair value of the Company’s available-for-sale securities balance at December 31, 2015, by contractual maturity, is as follows:

Due in one year or less	$	39,075
Due after one year		49,601
Total available for sale securities	$	88,676

			Gross		Gross
			Unrealized		Unrealized
	Amortized Cost		Gains		Losses			Fair Value
	(in thousands)
December 31, 2014
Cash and cash equivalents	$	32,780	$	—	$	—		$	32,780
Available for sale securities:
Certificates of deposit	$	13,429	—			—		$	13,429
U.S. Government debt securities		38,412		1		(28	)		38,385
Commercial paper		2,499		—		—			2,499
Corporate debt securities		21,854		3		(32	)		21,825
Total available for sale securities	$	76,194	$	4	$	(60	)	$	76,138
Total cash, cash equivalents, and available for sale securities	$	108,974	$	4	$	(60	)	$	108,918