Exhibit 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

	For the Year Ended December 31,															Nine-months ended 25-Sept-04			Proforma Nine-months ended 25-Sept-04
	1999			2000			2001			2002			2003
Earnings (loss)-
Loss before income taxes	$	(3,940	)	$	(5,847	)	$	(10,090	)	$	(34,017	)	$	(29,789	)	$	(60,989	)	$	(63,341	)
Add fixed Charges:
Interest expense on indebtedness	$	867		$	843		$	692		$	1,936		$	990		$	3,560		$	5,617
Estimated interest on rental expense		299			305			341			329			300			962			1,253
Amortization of deferred closing costs related to convertible notes		—			—			—			294			156			317			612
Amortization of discount on convertible notes		—			—			—			511			271
Total Adjusted Loss	$	(2,774	)	$	(4,699	)	$	(9,057	)	$	(30,947	)	$	(28,072	)	$	(55,859	)	$	(55,859	)
Fixed Charges-
Interest expense on indebtedness	$	867		$	843		$	692		$	1,936		$	990		$	3,560		$	5,617
Estimated interest on rental expense		299			305			341			329			300			1,253			1,253
Amortization of deferred closing costs related to convertible notes		—			—			—			294			156			317			612
Amortization of discount on convertible notes		—			—			—			511			271
Total Fixed Charges	$	1,166		$	1,148		$	1,033		$	3,070		$	1,717		$	5,130		$	7,482
Coverage deficiency	$	(3,940	)	$	(5,847	)	$	(10,090	)	$	(34,017	)	$	(29,789	)	$	(60,989	)	$	(63,341	)