Investments (Tables)

9 Months Ended

Sep. 30, 2012

Amortized Cost And Fair Value Of Investments with Gross Unrealized Gains And Losses

At December 31, 2010, the amortized cost and fair value of investments, with gross unrealized gains and losses, were as follows:

(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Money market funds	$	7,529	$	—	$	—		$	7,529
Commercial paper		6,748		1		—			6,749
Corporate securities		7,478		—		(3	)		7,475
U.S. government-backed securities		10,678		1		(2	)		10,677
U.S. treasury notes		1,274		—		—			1,274
Total investments	$	33,707	$	2	$	(5	)	$	33,704
Reported as:
Cash and cash equivalents								$	8,369
Marketable securities									24,852
Restricted cash									483
Total investments								$	33,704

At December 31, 2011, the amortized cost and fair value of investments, with gross unrealized gains and losses, were as follows:

(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Money market funds	$	2,973	$	—	$	—		$	2,973
Corporate securities		6,024		—		(2	)		6,022
U.S. government-backed securities		5,435		1		—			5,436
U.S. treasury notes		3,051		—		—			3,051
Total investments	$	17,483	$	1	$	(2	)	$	17,482
Reported as:
Cash and cash equivalents								$	2,768
Marketable securities									14,509
Restricted cash									205
Total investments								$	17,482

At September 30, 2012, the amortized cost and fair value of investments, with gross unrealized gains and losses, were as follows:

(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(unaudited)
Money market funds	$	5,733	$	—	$	—	$	5,733
Commercial paper		4,241		7		—		4,248
Corporate securities		5,263		1		—		5,264
U.S. government-backed securities		8,304		3		—		8,307
U.S. treasury notes		502		—		—		502
Total investments	$	24,043	$	11	$	—	$	24,054
Reported as:
Cash and cash equivalents							$	5,527
Marketable securities								18,322
Restricted cash								205
Total investments							$	24,054