Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

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 March 31, 2014 and December 31, 2013 are classified based on the valuation technique in the table below:

	March 31, 2014 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	$	56,980	$	0	$	56,980
Money market accounts		20,525		0		0		20,525
Total assets at fair value	$	20,525	$	56,980	$	0	$	77,505

The above table excludes $3.8 million of cash held in banks.

	December 31, 2013 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	$	56,976	$	0	$	56,976
Money market accounts		10,075		0		0		10,075
Total assets at fair value	$	10,075	$	56,976	$	0	$	67,051

Schedule of Short-Term Investments

Short-term Investments

	March 31, 2014
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	56,969	$	11	$	0	$	56,980
Total	$	56,969	$	11	$	0	$	56,980

	December 31, 2013
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	56,966	$	10	$	0	$	56,976
Total	$	56,966	$	10	$	0	$	56,976