<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-START>                             JAN-01-1996             APR-01-1996             JUL-01-1996
<PERIOD-END>                               MAR-31-1996             JUN-30-1996             SEP-30-1996
<CASH>                                          11,321                   7,205                   5,107
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   15,840                  19,738                  23,925
<ALLOWANCES>                                       455                     455                     865
<INVENTORY>                                     11,430                  15,911                  14,144
<CURRENT-ASSETS>                                39,561                  44,374                  43,499
<PP&E>                                           2,357                   2,771                   4,763
<DEPRECIATION>                                     810                     848                   1,009
<TOTAL-ASSETS>                                  41,233                  46,543                  48,636
<CURRENT-LIABILITIES>                            6,233                   7,812                   6,463
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                            15                      15                      15
<OTHER-SE>                                      34,849                  38,587                  40,884
<TOTAL-LIABILITY-AND-EQUITY>                    41,233                  46,543                  48,636
<SALES>                                         24,401                  25,601                  31,913
<TOTAL-REVENUES>                                25,683                  26,512                  32,756
<CGS>                                           13,873                  14,503                  21,792
<TOTAL-COSTS>                                   13,873                  14,503                  21,792
<OTHER-EXPENSES>                                 5,020                   5,481                   7,199
<LOSS-PROVISION>                                    13                      23                     224
<INTEREST-EXPENSE>                                  62                   (109)                   (130)
<INCOME-PRETAX>                                  6,728                   6,637                   3,895
<INCOME-TAX>                                       910                   2,671                   1,597
<INCOME-CONTINUING>                              6,728                   6,637                   3,895
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     5,818                   3,966                   2,298
<EPS-PRIMARY>                                     0.39                    0.26                    0.15
<EPS-DILUTED>                                     0.42                    0.26                    0.15
        

</TABLE>