##### 



Exhibit 12.1
 Computation of Ratio of Earnings to Fixed Charges and Ratio of Earnings to Combined
Fixed Charges and Preferred Stock Dividend Requirements
(in thousands, except for ratios)
 Ratio of Earnings to Fixed Charges
 Year Ended December 31,2005
    
    
    2004
    
    
    2003
    
    
    2002
    
    
    2001Loss before income taxes
    
    $
    (59,011
    )
    
    $
    (93,666
    )
    
    $
    (81,038
    )
    
    $
    (45,235
    )
    
    $
    (34,185
    )Add: Fixed charges
    
    
    13,263
    
    
    
    13,433
    
    
    
    10,743
    
    
    
    6,576
    
    
    
    4,450Less: Capitalized interest
    
    
    
    
    
    
    
    
    
    
    (832
    )
    
    
    (765
    )
    
    
    Earnings, as defined
    
    $
    (45,748
    )
    
    $
    (80,233
    )
    
    $
    (71,127
    )
    
    $
    (39,424
    )
    
    $
    (29,735
    )Interest expense
    
    $
    10,679
    
    
    $
    9,885
    
    
    $
    5,360
    
    
    $
    1,011
    
    
    $
    500Capitalized interest
    
    
    
    
    
    
    
    
    
    
    832
    
    
    
    765
    
    
    
    Estimated interest portion of rental expense
    
    
    2,584
    
    
    
    3,548
    
    
    
    4,551
    
    
    
    4,800
    
    
    
    3,950Fixed charges
    
    $
    13,263
    
    
    $
    13,433
    
    
    $
    10,743
    
    
    $
    6,576
    
    
    $
    4,450Deficiency of earnings to fixed charges
    
    $
    (59,011
    )
    
    $
    (93,666
    )
    
    $
    (81,870
    )
    
    $
    (46,000
    )
    
    $
    (34,185
    )Ratio of earnings to fixed charges
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
 Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividend Requirements
 Year Ended December 31,2005
    
    
    2004
    
    
    2003
    
    
    2002
    
    
    2001Earnings, as defined (from above)
    
    $
    (45,748
    )
    
    $
    (80,233
    )
    
    $
    (71,127
    )
    
    $
    (39,424
    )
    
    $
    (29,735
    )Preferred stock dividend requirements
    
    
    4
    
    
    
    100
    
    
    
    230
    
    
    
    702
    
    
    
    785Earnings, as defined
    
    $
    (45,744
    )
    
    $
    (80,133
    )
    
    $
    (70,897
    )
    
    $
    (38,722
    )
    
    $
    (28,950
    )Fixed charges (from above)
    
    $
    13,263
    
    
    $
    13,433
    
    
    $
    10,743
    
    
    $
    6,576
    
    
    $
    4,450Preferred stock dividend requirements
    
    
    4
    
    
    
    100
    
    
    
    230
    
    
    
    702
    
    
    
    785Combined fixed charges and preferred
stock dividend requirements
    
    $
    13,267
    
    
    $
    13,533
    
    
    $
    10,973
    
    
    $
    7,278
    
    
    $
    5,235Deficiency of earnings to combined
fixed charges and preferred stock
dividend requirements
    
    $
    (59,011
    )
    
    $
    (93,666
    )
    
    $
    (81,870
    )
    
    $
    (46,000
    )
    
    $
    (34,185
    )Ratio of earnings to combined fixed
charges and preferred stock dividend
requirements
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A
    
    
    
    N/A