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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

	Fair Value at December 31, 2012						Fair Value at December 31, 2011
Assets	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Corporate debt securities and auction rate securities	$	-	$	32,945	$	-	$	-	$	4,205	$	-
Total investments	$	-	$	32,945	$	-	$	-	$	4,205	$	-
Liabilities
Warrant liabilities	$	-	$	-	$	267	$	-	$	-	$	368

Reconciliation of Level 3 Assets and Liabilities

	Fair Value Measurements of Warrants Using Significant Unobservable Inputs (Level 3)
Balance at December 31, 2011	$	368
Change in fair value of Warrant liability		(101	)
Balance at December 31, 2012	$	267

- 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.

+ References+ Details