<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ANNUAL
REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
FOR THE FISCAL YEAR ENDED DECEMBER 31, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                    YEAR                    YEAR
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1998             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               DEC-31-1998             DEC-31-1997             DEC-31-1996
<CASH>                                         140,864                  16,450                       0
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                    5,184                   2,085                       0
<ALLOWANCES>                                       405                     165                       0
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                               150,565                  22,082                       0
<PP&E>                                          60,449                  36,166                       0
<DEPRECIATION>                                  25,243                  12,768                       0
<TOTAL-ASSETS>                                 266,341                  46,887                       0
<CURRENT-LIABILITIES>                           61,296                  32,504                       0
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                         41                       0                       0
<COMMON>                                           291                     225                       0
<OTHER-SE>                                     197,012                   5,850                       0
<TOTAL-LIABILITY-AND-EQUITY>                   266,341                  46,887                       0
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                               175,941              80,888<F1>              33,230<F1>
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                   77,328              38,065<F1>              19,783<F1>
<OTHER-EXPENSES>                               160,852              71,277<F1>              43,705<F1>
<LOSS-PROVISION>                                 3,725                   3,526                   2,526
<INTEREST-EXPENSE>                               1,967                   2,099                   1,041
<INCOME-PRETAX>                               (59,782)                (29,916)                (31,149)
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                           (62,239)                (28,454)                (30,258)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                  (67,383)                (29,916)                (31,149)
<EPS-PRIMARY>                                   (2.58)                  (1.50)                  (2.57)
<EPS-DILUTED>                                   (2.58)                  (1.50)                  (2.57)
<FN>
<F1>Certain amounts in prior years are reclassified to conform to current year presentation.
</FN>
        

</TABLE>