<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED> 
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1998             DEC-31-1998
<PERIOD-START>                             OCT-01-1997             JAN-01-1998             APR-01-1998
<PERIOD-END>                               DEC-31-1997             MAR-31-1998             JUN-30-1998
<CASH>                                          56,566                  52,049                  34,840
<SECURITIES>                                         0                       0                  17,149
<RECEIVABLES>                                    2,544                   2,580                   3,565
<ALLOWANCES>                                      (154)                   (318)                   (860)
<INVENTORY>                                      5,632                   7,921                   7,213
<CURRENT-ASSETS>                                65,453                  62,727                  63,313
<PP&E>                                           2,219                   3,753                   4,829
<DEPRECIATION>                                    (684)                 (1,014)                 (1,413)
<TOTAL-ASSETS>                                  67,143                  65,610                  68,874
<CURRENT-LIABILITIES>                            4,874                   7,123                  12,086
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                            19                      19                      19
<OTHER-SE>                                      62,250                  58,468                  54,769
<TOTAL-LIABILITY-AND-EQUITY>                    67,143                  65,610                  66,874
<SALES>                                         88,981                  40,169                  50,796
<TOTAL-REVENUES>                                88,981                  40,169                  50,796
<CGS>                                           75,336                  35,652                  44,815
<TOTAL-COSTS>                                   92,352                  45,087                  54,226
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0
<INCOME-PRETAX>                                 (2,472)                 (4,191)                 (4,037)
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                             (2,472)                 (4,191)                 (4,037)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    (2,472)                 (4,191)                 (4,037)
<EPS-PRIMARY>                                    (0.16)                  (0.22)                  (0.21)
<EPS-DILUTED>                                    (0.16)                  (0.22)                  (0.21)
        

</TABLE>