<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997    DEC-31-1996
<PERIOD-START>                             JAN-01-1997    JAN-01-1996
<PERIOD-END>                               SEP-30-1997    SEP-30-1996
<CASH>                                           8,423              0
<SECURITIES>                                         0              0
<RECEIVABLES>                                   10,904              0
<ALLOWANCES>                                       495              0
<INVENTORY>                                      6,364              0
<CURRENT-ASSETS>                                26,954              0
<PP&E>                                          14,089              0
<DEPRECIATION>                                   7,524              0
<TOTAL-ASSETS>                                  48,563              0
<CURRENT-LIABILITIES>                           13,267              0
<BONDS>                                              0              0
<PREFERRED-MANDATORY>                                0              0
<PREFERRED>                                          0              0
<COMMON>                                        19,917              0
<OTHER-SE>                                       (540)              0
<TOTAL-LIABILITY-AND-EQUITY>                    48,563              0
<SALES>                                         52,140         44,158
<TOTAL-REVENUES>                                52,140         44,158
<CGS>                                           33,036         28,313
<TOTAL-COSTS>                                   44,644         38,049
<OTHER-EXPENSES>                                     0              0
<LOSS-PROVISION>                                     0              0
<INTEREST-EXPENSE>                                 239          1,329
<INCOME-PRETAX>                                  7,257          4,780
<INCOME-TAX>                                     2,818          1,774
<INCOME-CONTINUING>                              4,439          2,808
<DISCONTINUED>                                       0              0
<EXTRAORDINARY>                                      0              0
<CHANGES>                                            0              0
<NET-INCOME>                                     4,439          2,808
<EPS-PRIMARY>                                     0.54<F1>       0.66<F1>
<EPS-DILUTED>                                     0.52<F1>       0.66<F1>
<FN>                                                                          
<F1>                                                                          
This information has been prepared in accordance with SFAS No. 128, and basic 
and diluted EPS have been entered in place of primary and fully diluted, 
respectively.                                                                 
</FN>                                                                         
                                                                              

</TABLE>