Exhibit 12.1

Computation of Ratio of Earnings to Fixed Charges

(in thousands)

	Fiscal Year Ended December 31,
	2011			2010			2009			2008			2007
Loss:
Loss from continuing operations	$	(48,214	)	$	(40,112	)	$	(19,885	)	$	(14,542	)	$	(7,226	)
Add: Fixed charges		4,012			2,516			1,232			1,540			211
Less: Capitalized interest		(297	)		—			—			—			—
Total loss	$	(44,499	)	$	(37,596	)	$	(18,653	)	$	(13,002	)	$	(7,015	)
Fixed Charges:
Interest expense	$	2,649		$	1,612		$	868		$	283		$	86
Amortization and expensing of debt expense		928			762			235			1,102			54
Interest component of rent expense		138			142			129			155			71
Capitalized interest		297			—			—			—			—
Total fixed charges	$	4,012		$	2,516		$	1,232		$	1,540		$	211
Ratio of Earnings to Fixed Charges		—			—			—			—			—
Deficiency of Earnings Available to Cover Fixed Charges	$	(48,511	)	$	(40,112	)	$	(19,885	)	$	(14,542	)	$	(7,226	)