FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2013

Schedule of fair value measurements along with the level within the fair value hierarchy in which the fair value measurements fall

The following table presents the Company’s fair value measurements as of September 30, 2013 along with the level within the fair value hierarchy in which the fair value measurements in their entirety fall. Amounts in the table are in thousands.

			Fair Value Measurement at September 30, 2013 Using:
			Quoted Prices in Active		Significant Other		Significant Unobservable
	Fair Value at		Markets for Identical Assets		Observable Inputs		Inputs
Description	September 30, 2013		(Level 1)		(Level 2)		(Level 3)

Cash and cash equivalents
Cash and money market	$	9,710	$	9,710	$	—	$	—
Available-for-Sale
Marketable securities
U.S. government agency securities	44,533		—		44,533		—
Corporate bonds	81,025		—		81,025		—
Certificates of deposit	7,574		—		7,574		—
Commercial paper	4,999		—		4,999		—
Total	$	147,841	$	9,710	$	138,131	$	—

The following table presents the Company’s fair value measurements as of December 31, 2012 along with the level within the fair value hierarchy in which the fair value measurements in their entirety fall. Amounts in the table are in thousands.

			Fair Value Measurement at December 31, 2012 Using:
			Quoted Prices in Active		Significant Other		Significant Unobservable
	Fair Value at		Markets for Identical Assets		Observable Inputs		Inputs
Description	December 31, 2012		(Level 1)		(Level 2)		(Level 3)

Cash and cash equivalents
Cash and money market	$	13,095	$	13,095	$	—	$	—
Corporate bonds	250		—		250		—
Available-for-Sale
Marketable securities
U.S. government agency securities	44,308		—		44,308		—
Certificates of deposit	5,939		—		5,939		—
Corporate bonds	43,330		—		43,330		—
Commercial paper	1,199		—		1,199		—
Total	$	108,121	$	13,095	$	95,026	$	—

Summary of contractual maturities available for the sale of investments in debt securities

The following summarizes contractual underlying maturities of the Company’s available-for-sale investments in debt securities at September 30, 2013 (in thousands):

	Cost		Fair Value
Due in one year or less	$	85,409	$	85,452
Due after one year through two years	52,604		52,679
	$	138,013	$	138,131

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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