Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Cash, Cash Equivalents And Investments, As Well As Hierarchy For Financial Instruments Measured At Fair Value On 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
December 31, 2012:
Cash equivalents:
Money market funds	$	48,693	$	48,693		—		—
Short-term investments:
U.S. Treasury bills	$	224,939	$	224,939		—		—

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 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
December 31, 2012:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	22,608	$	22,608		—		—
Liabilities:
Convertible Notes	$	324,731		—	$	324,731		—

December 31, 2011:
Assets:
Bank deposits (included in “Cash and cash equivalents”)	$	26,092	$	26,092		—		—

- Definition

Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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