
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS AS FILED ON FORM 10-Q FOR THE QUARTER ENDED MARDCH 31, 1998
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                          11,397
<SECURITIES>                                    72,443
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                86,980
<PP&E>                                          32,649
<DEPRECIATION>                                 (5,899)
<TOTAL-ASSETS>                                 113,873
<CURRENT-LIABILITIES>                           14,642
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       135,924
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                   113,873
<SALES>                                              0
<TOTAL-REVENUES>                                 3,865
<CGS>                                                0
<TOTAL-COSTS>                                    9,142
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               (123)
<INCOME-PRETAX>                                (4,149)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (4,149)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (4,149)
<EPS-PRIMARY>                                   (0.27)
<EPS-DILUTED>                                        0
        

</TABLE>
