FAIR VALUE DISCLOSURES (Tables)

6 Months Ended

Jun. 30, 2012

Cash, Cash Equivalents And Investments, As Well As The Hierarchy For Financial Instruments Measured At Fair Value On A Recurring Basis

The following table presents the Company’s cash equivalents and short-term investments, as well as the hierarchy for its financial instruments measured at fair value on a recurring basis:

			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
June 30, 2012:
Cash equivalents:
Money market funds	$	45,667	$	45,667		—		—
Short-term investments:
U.S. Treasury bills	$	199,948	$	199,948		—		—
December 31, 2011:
Cash equivalents:
Money market funds	$	44,044	$	44,044		—		—
Short-term investments:
U.S. Treasury bills	$	74,996	$	74,996		—		—

Fair Value Of Other Financial Instruments Not Measured On A Recurring Basis

In the table below, the Company has presented the fair value of other financial instruments that are not measured at fair value on a recurring basis.

			Fair value measurements using:
	Fair Value		Level 1		Level 2		Level 3
June 30, 2012:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	98,852	$	98,852		—		—
Liabilities:
Convertible Notes	$	289,800		—	$	289,800		—
December 31, 2011:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	26,092	$	26,092		—		—