Available for Sale Securities

9 Months Ended

Sep. 30, 2015

Investments Debt And Equity Securities [Abstract]

Available for Sale Securities

3. Available for sale securities

Available for sale securities at September 30, 2015 and December 31, 2014 consist of the following:

			Gross		Gross
			Unrealized		Unrealized
	Amortized Cost		Gains		Losses			Fair Value
	(in thousands)
September 30, 2015
Cash and cash equivalents:
Cash and money market account	$	66,712	$	—	$	—		$	66,712
Total cash and cash equivalents	$	66,712	$	—	$	—		$	66,712
Available for sale securities:
Certificates of deposit	$	20,170	—		—			$	20,170
U.S. Government debt securities		48,531		15		(6	)		48,540
Corporate debt securities		22,060		5		(21	)		22,044
Total available for sale securities	$	90,761	$	20	$	(27	)	$	90,754
Total cash, cash equivalents, and available for sale securities	$	157,473	$	20	$	(27	)	$	157,466

The estimated fair value of the Company’s available for sale securities balance at September 30, 2015, by contractual maturity, is as follows:

Due in one year or less	$	39,783
Due after one year		50,971
Total available for sale securities	$	90,754

			Gross		Gross
			Unrealized		Unrealized
	Amortized Cost		Gains		Losses			Fair Value
	(in thousands)
December 31, 2014
Cash and cash equivalents:
Cash and money market account	$	32,780	$	—	$	—		$	32,780
Total 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