Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Measurements [Abstract]

Schedule of financial instruments measured at fair value on a recurring basis

	September 30, 2012
	Fair value measurements using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
Assets:
U.S. Treasury securities	$	0	$	38,985	$	0	$	38,985
Money market accounts		4,628		0		0		4,628
Total assets at fair value	$	4,628	$	38,985	$	0	$	43,613

The above table excludes $4.3 million of cash held in banks.

	December 31, 2011
	Fair value measurements using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
	(In thousands)
Assets:
U.S. Treasury securities	$	0	$	48,987	$	0	$	48,987
Money market accounts		3,617		0		0		3,617
Total assets at fair value	$	3,617	$	48,987	$	0	$	52,604

Schedule of short-term investments

	September 30, 2012
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	38,979	$	6	$	0	$	38,985
Total	$	38,979	$	6	$	0	$	38,985

	December 31, 2011
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	48,970	$	17	$	0	$	48,987
Total	$	48,970	$	17	$	0	$	48,987