<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5

<S>                              <C>                   <C>                   <C>                   <C>                  <C>
<PERIOD-TYPE>                    YEAR                  3-MOS                 3-MOS                 6-MOS                6-MOS
<FISCAL-YEAR-END>                DEC-31-1998           DEC-31-1998           DEC-31-1999           DEC-31-1998          DEC-31-1999
<PERIOD-START>                   JAN-01-1998           APR-01-1998           APR-01-1999           JAN-01-1998          JAN-01-1999
<PERIOD-END>                     DEC-31-1998           JUN-30-1998           JUN-30-1999           JUN-30-1998          JUN-30-1999
<CASH>                            25,597,461                     0            11,242,052                     0                    0
<SECURITIES>                               0                     0             7,957,400                     0                    0
<RECEIVABLES>                     19,570,031                     0            24,377,914                     0                    0
<ALLOWANCES>                     (1,908,811)                     0           (1,581,197)                     0                    0
<INVENTORY>                        6,826,732                     0            11,337,352                     0                    0
<CURRENT-ASSETS>                  73,019,623                     0             4,471,935                     0                    0
<PP&E>                            28,139,460                     0            44,784,898                     0                    0
<DEPRECIATION>                   (4,882,832)                     0           (8,906,829)                     0                    0
<TOTAL-ASSETS>                   185,655,629                     0           200,595,437                     0                    0
<CURRENT-LIABILITIES>             44,519,887                     0            61,376,560                     0                    0
<BONDS>                          168,267,797                     0           189,097,280                     0                    0
<PREFERRED-MANDATORY>                      0                     0                     0                     0                    0
<PREFERRED>                                0                     0            19,206,378                     0                    0
<COMMON>                          27,486,554                     0            36,438,015                     0                    0
<OTHER-SE>                      (48,835,439)                     0          (93,625,034)                     0                    0
<TOTAL-LIABILITY-AND-EQUITY>               0                     0                     0                     0                    0
<SALES>                                    0             5,559,292            19,892,783            10,275,084           35,063,073
<TOTAL-REVENUES>                           0             7,981,838            36,624,340            14,504,703           67,105,206
<CGS>                                      0             4,396,718            14,769,465             8,279,174           26,361,176
<TOTAL-COSTS>                              0             4,798,024            22,652,397            10,569,675           42,725,966
<OTHER-EXPENSES>                           0             8,901,277            31,518,396            15,725,561           57,718,869
<LOSS-PROVISION>                           0               144,180             (148,004)               144,180              754,464
<INTEREST-EXPENSE>                         0             5,830,022             6,149,357             5,882,591           12,086,022
<INCOME-PRETAX>                            0          (11,168,720)          (23,327,991)          (16,279,387)         (44,015,240)
<INCOME-TAX>                               0                     0                     0                     0                    0
<INCOME-CONTINUING>                        0          (11,168,720)          (23,327,991)          (16,279,387)         (44,015,240)
<DISCONTINUED>                             0                     0                     0                     0                    0
<EXTRAORDINARY>                            0                     0                     0                     0                    0
<CHANGES>                                  0                     0                     0                     0                    0
<NET-INCOME>                               0          (11,168,720)          (23,327,991)          (16,279,387)         (44,015,240)
<EPS-BASIC>                                0                (0.82)                (1.64)                (1.20)               (3.12)
<EPS-DILUTED>                              0                  0.82                (1.64)                (1.20)               (3.12)


</TABLE>