Exhibit 12.1

COMPUTATION OF RATION OF EARNINGS TO FIXED CHARGES

Our earnings are inadequate to cover fixed charges. The following table sets forth the dollar amount of the coverage deficiency for each of the years ended December 31, 2012, 2011, 2010, 2009 and 2008. We have not included a ratio of earnings to combined fixed charges and preferred stock dividends because we do not have earnings. We have derived the deficiency of earnings to cover fixed charges from our historical financial statements. The following should be read in conjunction with our consolidated financial statements, including the notes thereto, and the other financial information included or incorporated by reference herein.

	Fiscal Year Ended December 31,
	2012			2011			2010			2009			2008
(dollars in thousands)
Net loss	$	(94,465	)	$	(109,388	)	$	(140,166	)	$	(87,703	)	$	(43,754	)
Add back: Fixed charges		471			518			367			146			183
Total adjusted net loss	$	(93,994	)	$	(108,870	)	$	(139,799	)	$	(87,557	)	$	(43,571	)
Fixed charges:
Interest expense		275			287			194			30			92
Interest portion of rental expense		196			231			173			116			91
Total fixed charges		471			518			367			146			183
Deficiency of earnings available to fixed charges (1)	$	(94,465	)	$	(109,388	)	$	(140,166	)	$	(87,703	)	$	(43,754	)

(1) Because of the deficiency of earnings available to cover fixed charges, the ratio information is not applicable.