Exhibit 12.01

Computation of
Ratio of Earnings to Fixed Charges

     The table below presents the ratio of earnings to fixed charges, ratio of earnings to combined fixed charges and preferred stock dividends, and the coverage deficiency for the last five fiscal years and the fiscal quarter ended March 31, 2004 (dollar amounts in thousands).

	Three
	Months
	Ended March 31,			Year Ended December 31,
	2004			2003			2002			2001			2000(1)			1999
	(in thousands)
Net loss	$	(18,068	)	$	(53,947	)	$	(59,270	)	$	(60,317	)	$	(38,502	)	$	(26,868	)
Add:
Fixed charges		3,669			5,221			1,664			1,650			1,641			1,232
Earnings as adjusted	$	(14,399	)	$	(48,726	)	$	(57,606	)	$	(58,667	)	$	(36,861	)	$	(25,636	)
Fixed charges
Interest	$	1,091		$	2,807		$	501		$	500		$	504		$	640
Amortization of debt issue costs		215			375			—			—			—			—
Revenue interest expense		2,335			1,557			—			—			—			—
Portion of rent representative of the interest factor		28			482			1,163			1,150			1,137			592
Total fixed charges	$	3,669		$	5,221		$	1,664		$	1,650		$	1,641		$	1,232
Deficiency of earnings to cover fixed charges	$	18,068		$	53,947		$	59,270		$	60,317		$	38,502		$	26,868

(1)     Net loss excludes the cumulative effect of an accounting change of $8.6 million of contract revenues that were deferred upon adoption of Staff Accounting Bulletin 101.

     For the purposes of computing the ratio of fixed charges, earnings consist of income (loss) before provision for income taxes plus fixed charges. Fixed charges consist of interest charges, amortization of debt issuance costs and that portion of rental expense we believe to be representative of interest, which is deemed to be 33% of operating lease rentals.