Available for Sale Securities

9 Months Ended

Sep. 30, 2016

Investments Debt And Equity Securities [Abstract]

Available for Sale Securities

3. Available for sale securities

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

			Gross		Gross
			Unrealized		Unrealized
	Amortized Cost		Gains		Losses			Fair Value
	(in thousands)
September 30, 2016
Cash and cash equivalents	$	65,830	$	—	$	—		$	65,830
Available for sale securities:
Certificates of deposit	$	17,575	—		—			$	17,575
U.S. Government debt securities		71,968		12		(14	)		71,966
Corporate debt securities		5,956	—			(5	)		5,951
Total available for sale securities	$	95,499	$	12	$	(19	)	$	95,492
Total cash, cash equivalents, and available for sale securities	$	161,329	$	12	$	(19	)	$	161,322

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

Due in one year or less	$	78,818
Due after one year		16,674
Total available for sale securities	$	95,492