Available for Sale Securities

6 Months Ended

Jun. 30, 2015

Investments Debt And Equity Securities [Abstract]

Available for Sale Securities

3. Available for sale securities

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

			Gross		Gross
			Unrealized		Unrealized
	Amortized Cost		Gains		Losses			Fair Value
	(in thousands)
June 30, 2015
Cash and cash equivalents:
Cash and money market account	$	76,248	$	—	$	—		$	76,248
Total cash and cash equivalents	$	76,248	$	—	$	—		$	76,248
Available for sale securities:
Certificates of deposit	$	19,721	—		—			$	19,721
U.S. Government debt securities		38,546		10		(14	)		38,542
Corporate debt securities		18,301		2		(25	)		18,278
Total available for sale securities	$	76,568	$	12	$	(39	)	$	76,541
Total cash, cash equivalents, and available for sale    securities	$	152,816	$	12	$	(39	)	$	152,789

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

Due in one year or less	$	37,785
Due after one year		38,756
Total available for sale securities	$	76,541

			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