Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	For the Year Ended December 31,															Proforma
	2000			2001			2002			2003			2004			2004
Earnings (loss) –
Loss before income taxes	$	(5,847	)	$	(10,090	)	$	(34,017	)	$	(29,789	)	$	(93,271	)	$	(95,732	)
Add fixed Charges:
Interest expense on indebtedness	$	843		$	692		$	1,936		$	990		$	4,480		$	6,537
Estimated interest on rental expense		305			341			329			300			1,721			1,721
Amortization of deferred closing costs related to convertible notes		—			—			294			156			521			893
Amortization of discount on convertible notes		—			—			511			271
Total Adjusted Loss	$	(4,699	)	$	(9,057	)	$	(30,947	)	$	(28,072	)	$	(86,549	)	$	(86,581	)
Fixed Charges –
Interest expense on indebtedness	$	843		$	692		$	1,936		$	990		$	4,480		$	6,537
Estimated interest on rental expense		305			341			329			300			1,721			1,721
Amortization of deferred closing costs related to convertible notes		—			—			294			156			521			893
Amortization of discount on convertible notes		—			—			511			271
Total Fixed Charges	$	1,148		$	1,033		$	3,070		$	1,717		$	6,722		$	9,151
Coverage deficiency	$	(5,847	)	$	(10,090	)	$	(34,017	)	$	(29,789	)	$	(93,271	)	$	(95,732	)