Available for Sale Securities

6 Months Ended

Jun. 30, 2016

Investments Debt And Equity Securities [Abstract]

Available for Sale Securities

3. Available for sale securities

Available for sale securities at June 30, 2016 and December 31, 2015 consist of the following:

			Gross		Gross
			Unrealized		Unrealized
	Amortized Cost		Gains		Losses			Fair Value
	(in thousands)
June 30, 2016
Cash and cash equivalents	$	46,177	$	—	$	—		$	46,177
Available for sale securities:
Certificates of deposit	$	19,063	—		—			$	19,063
U.S. Government debt securities		111,004		38		(5	)		111,037
Corporate debt securities		12,368		5		(1	)		12,372
Total available for sale securities	$	142,435	$	43	$	(6	)	$	142,472
Total cash, cash equivalents, and available for sale securities	$	188,612	$	43	$	(6	)	$	188,649

			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 June 30, 2016, by contractual maturity, is as follows:

Due in one year or less	$	114,894
Due after one year		27,578
Total available for sale securities	$	142,472