Fair Value Measurements

9 Months Ended

Sep. 30, 2011

Fair Value Measurements [Abstract]

Fair Value Measurements

3. Fair Value Measurements

The Company measures certain financial assets at fair value on a recurring basis, including cash equivalents, and short and long-term investments. The fair value of these financial assets was determined based on three levels of input as follows:

• Level 1. Quoted prices in active markets for identical assets and liabilities;

• Level 2. Observable inputs other than quoted prices in active markets; and

• Level 3. Unobservable inputs.

The fair value hierarchy of the Company’s financial assets and liabilities carried at fair value and measured on a recurring basis is as follows:

			Fair Value Measurements at Reporting Date Using
			Quoted Prices
			in Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
	September 30,		Assets		Inputs		Inputs
	2011		(Level 1)		(Level 2)		(Level 3)
	(Unaudited)
Money market funds(1)	$	9,823	$	9,823	$	—	$	—
Short-term investments(2)		21,148		—		21,148		—
Long-term investments(2)		9,844		—		9,844		—
Total	$	40,815	$	9,823	$	30,992	$	—

			Fair Value Measurements at Reporting Date Using
			Quoted Prices
			in Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
	December 31,		Assets		Inputs		Inputs
	2010		(Level 1)		(Level 2)		(Level 3)
Money market funds(1)	$	23,375	$	23,375	$	—	$	—
Short-term investments(2)		17,550		—		17,550		—
Total	$	40,925	$	23,375	$	17,550	$	—

(1)	Included in cash and cash equivalents on the accompanying consolidated balance sheets; valued at quoted market prices in active markets.
(2)	Our short and long-term investments consist of government agency and municipal bonds; their fair value is calculated using an interest rate yield curve for similar instruments.