<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE ANNUAL
REPORT AND 10-K FOR THE PERIOD ENDED DECEMBER 31, 1997 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                            2440                   22495                   14742
<SECURITIES>                                         0                       0                    3990
<RECEIVABLES>                                     6421                    8270                   15149
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                       6198                    8394                   11023
<CURRENT-ASSETS>                                 18103                   41026                   46135
<PP&E>                                             901                    2723                    3163
<DEPRECIATION>                                    1503                    1671                    2091
<TOTAL-ASSETS>                                   21196                   47779                   52552
<CURRENT-LIABILITIES>                            11236                   14255                   17102
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                            10                      12                      12
<OTHER-SE>                                        9603                   28614                   35125
<TOTAL-LIABILITY-AND-EQUITY>                     21196                   47779                   52552
<SALES>                                           9377                   22785                   38243
<TOTAL-REVENUES>                                  9377                   22785                   38243
<CGS>                                             4708                   11401                   19132
<TOTAL-COSTS>                                     3926                    9302                   14605
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                  27                     288                     346
<INCOME-PRETAX>                                    808                    2067                    4301
<INCOME-TAX>                                       125                     468                     714
<INCOME-CONTINUING>                                645                    1561                    3549
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                       645                    1561                    3549
<EPS-PRIMARY>                                     0.07                    0.15                    0.33
<EPS-DILUTED>                                     0.06                    0.14                    0.30


</TABLE>