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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Fair Value Hierarchy of Financial Assets and Financial Liabilities Carried at Fair Value

As of December 31, 2013 and 2012, the fair value hierarchy for our financial assets and financial liabilities that are carried at fair value was as follows (in thousands):


	December 31, 2013								December 31, 2012
	Fair Value		Level I		Level II		Level III		Fair Value		Level I		Level II		Level III
Money market funds	$	460,313	$	460,313	$	—	$	—	$	60,272	$	60,272	$	—	$	—
Common stock warrant liability	$	—	$	—	$	—	$	—	$	10,692	$	—	$	—	$	10,692

Schedule of Changes in Fair Value of Common Stock Warrant Liability

The changes in the fair value of our common stock warrant liability were as follows (in thousands):


	Year Ended December 31,
	2013			2012
Fair value, beginning of period	$	10,692		$	8,838
Change in fair value		(10,692	)		1,854

Fair value, end of period	$	—		$	10,692

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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