Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

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, 2015 and December 31, 2014 are classified based on the valuation technique in the table below:

	March 31, 2015 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	$	37,987	$	0	$	37,987
Money market accounts		24,523		0		0		24,523
Total assets at fair value	$	24,523	$	37,987	$	0	$	62,510

The above table excludes $15.8 million of cash held in banks.

	December 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	$	42,981	$	0	$	42,981
Money market accounts		11,524		0		0		11,524
Total assets at fair value	$	11,524	$	42,981	$	0	$	54,505

The above table excludes $2.9 million of cash held in banks.

Schedule of Short-Term Investments

Short-term Investments

	March 31, 2015
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	37,985	$	2	$	0	$	37,987
Total	$	37,985	$	2	$	0	$	37,987

	December 31, 2014
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	42,980	$	1	$	0	$	42,981
Total	$	42,980	$	1	$	0	$	42,981