<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S CONSOLIDATED BALANCE SHEETS AS OF 12-31-95 AND 1996, RESPECTIVELY &
THE RELATED CONSOLIDATED STATEMENTS OF OPERATIONS FOR THE YEARS ENDED 12-31-95
& 1996, RESPECTIVELY, & THE NOTES THERETO, & IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH CONSOLIDATED FINANCIAL STATEMENTS & NOTES.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1996
<PERIOD-END>                               DEC-31-1995             DEC-31-1996
<CASH>                                          25,554                 131,101
<SECURITIES>                                    42,266                 109,244
<RECEIVABLES>                                    6,957                  24,092
<ALLOWANCES>                                         0                       0
<INVENTORY>                                      3,069                   7,544
<CURRENT-ASSETS>                                78,458                 271,981
<PP&E>                                          17,509                  30,276
<DEPRECIATION>                                   1,376                   2,776
<TOTAL-ASSETS>                                 143,997                 504,670
<CURRENT-LIABILITIES>                           18,741                  52,117
<BONDS>                                          6,611                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                       216,514                 525,350
<OTHER-SE>                                   (107,417)                (81,773)
<TOTAL-LIABILITY-AND-EQUITY>                   143,997                 504,670
<SALES>                                              0                       0
<TOTAL-REVENUES>                                51,502                 104,119
<CGS>                                           10,618                  21,301
<TOTAL-COSTS>                                   44,981                  82,472
<OTHER-EXPENSES>                                43,773                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                 906                     674
<INCOME-PRETAX>                               (35,372)                  27,867
<INCOME-TAX>                                       406                   3,539
<INCOME-CONTINUING>                           (35,778)                  24,328
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                  (35,778)                  24,328
<EPS-PRIMARY>                                   (1.53)                    0.68
<EPS-DILUTED>                                   (1.53)                    0.60


</TABLE>