<TABLE> <S> <C>
<PAGE>
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<RESTATED>
<MULTIPLIER> 1,000
<S> <C> <C>
<PERIOD-TYPE> YEAR YEAR
<FISCAL-YEAR-END> DEC-31-1999 DEC-31-1998
<PERIOD-START> JAN-01-1999 JAN-01-1998
<PERIOD-END> DEC-31-1999 DEC-31-1998
<CASH> 55,685 24,950
<SECURITIES> 56,120 2,953
<RECEIVABLES> 13,208 8,016
<ALLOWANCES> 294 261
<INVENTORY> 7,900 5,476
<CURRENT-ASSETS> 102,152 42,646
<PP&E> 18,701 13,947
<DEPRECIATION> 11,138 8,292
<TOTAL-ASSETS> 162,067 50,175
<CURRENT-LIABILITIES> 9,713 8,360
<BONDS> 0 0
0 0
0 0
<COMMON> 79 66
<OTHER-SE> 152,059 41,189
<TOTAL-LIABILITY-AND-EQUITY> 162,067 50,175
<SALES> 73,533 45,993
<TOTAL-REVENUES> 73,533 45,993
<CGS> 25,210 17,274
<TOTAL-COSTS> 30,506 23,199
<OTHER-EXPENSES> 0 0
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 35 143
<INCOME-PRETAX> 22,522 6,544
<INCOME-TAX> (2,812) 387
<INCOME-CONTINUING> 25,334 6,157
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> 25,344 6,157
<EPS-BASIC> 0.33 0.10
<EPS-DILUTED> 0.31 0.09
</TABLE>