Investments (Tables)

6 Months Ended

Jun. 30, 2013

Investments

Schedule of cash, cash equivalents and investments

 Cash, cash equivalents and investments at June 30, 2013 and December 31, 2012 consist of the following (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
June 30, 2013
Cash and cash equivalents:
Cash and money market accounts	$	7,880	$	—	$	—		$	7,880
Government-sponsored enterprise securities		6,000		—		—			6,000
Total cash and cash equivalents	$	13,880	$	—	$	—		$	13,880
Investments:
Government-sponsored enterprise securities (due within 1 year)	$	43,562	$	10	$	(1	)	$	43,571
Government-sponsored enterprise securities (due within 1 - 2 years)		20,570		—		(12	)		20,558
Total investments	$	64,132	$	10	$	(13	)	$	64,129
Total cash, cash equivalents, and investments	$	78,012	$	10	$	(13	)	$	78,009

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2012
Cash and cash equivalents:
Cash and money market accounts	$	10,096	$	—	$	—		$	10,096
Total cash and cash equivalents	$	10,096	$	—	$	—		$	10,096
Investments:
Government-sponsored enterprise securities (due within 1 year)	$	46,469	$	14	$	(3	)	$	46,480
Government-sponsored enterprise securities (due within 1 - 2 years)		34,931		14		(1	)		34,944
Total investments	$	81,400	$	28	$	(4	)	$	81,424
Total cash, cash equivalents, and investments	$	91,496	$	28	$	(4	)	$	91,520