Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

Financial instruments measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 are classified based on the valuation technique in the table below:

	September 30, 2013 Fair value measurements using						Total
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In thousands)
Assets:
U.S. Treasury securities	$	0	$	56,990	$	0	$	56,990
Money market accounts		3,064		0		0		3,064
Total assets at fair value	$	3,064	$	56,990	$	0	$	60,054

The above table excludes $4.6 million of cash held in banks.

	December 31, 2012 Fair value measurements using						Total
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In thousands)
Assets:
U.S. Treasury securities	$	0	$	38,988	$	0	$	38,988
Money market accounts		52		0		0		52
Total assets at fair value	$	52	$	38,988	$	0	$	39,040

The above table excludes $4.5 million of cash held in banks.

Schedule of Short-Term Investments

Short-term Investments

	September 30, 2013
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	47,976	$	14	$	0	$	47,990
Total	$	47,976	$	14	$	0	$	47,990

	December 31, 2012
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	38,980	$	8	$	0	$	38,988
Total	$	38,980	$	8	$	0	$	38,988