<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000
       
<S>                             <C>                                     <C>
<PERIOD-TYPE>                   6-MOS                                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998                             DEC-31-1997
<PERIOD-START>                             JAN-01-1998                             JAN-01-1997
<PERIOD-END>                               JUN-30-1998                             JUN-30-1997
<CASH>                                          19,178                                  25,618
<SECURITIES>                                         0                                       0
<RECEIVABLES>                                   10,998                                   4,446
<ALLOWANCES>                                       302                                      30
<INVENTORY>                                      7,141                                   3,782
<CURRENT-ASSETS>                                38,796                                  35,180
<PP&E>                                          11,426                                   7,838
<DEPRECIATION>                                   4,791                                   3,394
<TOTAL-ASSETS>                                  53,207                                  47,964
<CURRENT-LIABILITIES>                            5,402                                   5,567
<BONDS>                                              0                                       0
<PREFERRED-MANDATORY>                                0                                       0
<PREFERRED>                                          0                                       0
<COMMON>                                            13                                      11
<OTHER-SE>                                      45,975                                  41,152
<TOTAL-LIABILITY-AND-EQUITY>                    53,207                                  47,964
<SALES>                                         21,937                                  14,411
<TOTAL-REVENUES>                                21,937                                  14,411
<CGS>                                            6,930                                   5,481
<TOTAL-COSTS>                                    6,390                                   5,481
<OTHER-EXPENSES>                                13,366                                  10,361
<LOSS-PROVISION>                                     0                                       0
<INTEREST-EXPENSE>                                   0                                       0
<INCOME-PRETAX>                                  2,113                                 (1,169)
<INCOME-TAX>                                         0                                       0
<INCOME-CONTINUING>                              2,113                                 (1,169)
<DISCONTINUED>                                       0                                       0
<EXTRAORDINARY>                                      0                                       0
<CHANGES>                                            0                                       0
<NET-INCOME>                                     2,113                                 (1,169)
<EPS-PRIMARY>                                     0.16<F1>                              (0.09)
<EPS-DILUTED>                                     0.14                                  (0.09)
<FN>
<F1>For purposes of this exhibit, primary means basic.
</FN>
        

</TABLE>