<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
<CURRENCY> U. S. DOLLARS
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1997             DEC-31-1998
<PERIOD-START>                             JAN-01-1996             JAN-01-1997             JAN-01-1998
<PERIOD-END>                               DEC-31-1996             DEC-31-1997             DEC-31-1998
<EXCHANGE-RATE>                                      1                       1                       1
<CASH>                                          16,612                   7,816                   2,024
<SECURITIES>                                     6,918                   9,944                   3,128
<RECEIVABLES>                                    7,625                   6,224                   3,356
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                      8,737                   5,710                   8,546
<CURRENT-ASSETS>                                40,977                  30,131                  17,564
<PP&E>                                          13,625                  13,234                  13,267
<DEPRECIATION>                                   9,031                   9,962                  10,552
<TOTAL-ASSETS>                                  45,571                  33,403                  20,279
<CURRENT-LIABILITIES>                           10,380                   6,511                   1,449
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                        49,292                  49,347                  49,417
<OTHER-SE>                                    (14,101)                (22,455)                (34,266)
<TOTAL-LIABILITY-AND-EQUITY>                    45,571                  33,403                  20,279
<SALES>                                         32,175                  22,248                  10,416
<TOTAL-REVENUES>                                45,296                  26,944                  14,326
<CGS>                                           20,825                  12,722                   6,836
<TOTAL-COSTS>                                   25,670                  15,340                   8,596
<OTHER-EXPENSES>                                32,741                  20,319                  18,004
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                             (1,261)                 (1,052)                   (589)
<INCOME-PRETAX>                               (11,854)                 (7,665)                (11,685)
<INCOME-TAX>                                       160                     184                     175
<INCOME-CONTINUING>                           (12,014)                 (7,847)                (11,860)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                  (12,014)                 (7,847)                (11,860)
<EPS-PRIMARY>                                   (0.77)                  (0.51)                  (0.77)
<EPS-DILUTED>                                   (0.77)                  (0.51)                  (0.77)
        

</TABLE>