FAIR VALUE MEASUREMENTS

Cash Equivalents and Short-term Investments

The financial instruments of the Company measured at fair value on a recurring basis are cash equivalents and short-term investments.

The Company’s fixed income available-for-sale securities consist of high quality, investment grade securities. The Company values these securities based on pricing from pricing vendors, who may use quoted prices in active markets for identical assets (Level 1) or inputs other than quoted prices that are observable either directly or indirectly (Level 2) in determining fair value.

The types of instruments valued based on quoted market prices in active markets include money market securities. Such instruments are generally classified within Level 1 of the fair value hierarchy.

The types of instruments valued based on quoted prices in markets that are less active, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency are generally classified within Level 2 of the fair value hierarchy and include most U.S. treasury securities and most investment-grade corporate commercial paper.

The types of instruments valued based on unobservable inputs which reflect the reporting entity’s own assumptions or data that market participants would use in valuing an instrument are generally classified within Level 3 of the fair value hierarchy. The Company had no Level 3 instruments as of June 30, 2015 and December 31, 2014.

Financial instruments measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014 are classified based on the valuation technique in the table below:



	June 30, 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	$	—	$	18,998	$	—	$	18,998
Money market accounts	34,021		—		—		34,021
Total assets at fair value	$	34,021	$	18,998	$	—	$	53,019

The above table excludes $18.6 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	$	—	$	42,981	$	—	$	42,981
Money market accounts	11,524		—		—		11,524
Total assets at fair value	$	11,524	$	42,981	$	—	$	54,505

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

U.S. Treasury securities are classified as short-term investments, and money market accounts are classified as cash equivalents on the Company’s condensed consolidated balance sheets.

Short-term Investments



	June 30, 2015
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
	(In thousands)
U.S. Treasury securities	$	18,993	$	5	$	—	$	18,998
Total	$	18,993	$	5	$	—	$	18,998



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

The contractual maturities of the Company’s available-for-sale securities on June 30, 2015 and December 31, 2014 were all due within one year. There were no transfers of instruments between Level 1 and 2 during the three months and six months ended June 30, 2015 and the year ended December 31, 2014.