<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-31-1995             DEC-31-1996             DEC-31-1997
<PERIOD-START>                             JAN-01-1995             JAN-01-1996             JAN-01-1997
<PERIOD-END>                               DEC-31-1995             DEC-31-1996             DEC-31-1997
<EXCHANGE-RATE>                                      1                       1                       1
<CASH>                                          25,829                  16,612                   5,317
<SECURITIES>                                     6,863                   6,918                  12,443
<RECEIVABLES>                                   12,138                   7,625                   6,224
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                      4,425                   8,737                   5,710
<CURRENT-ASSETS>                                50,712                  40,977                  30,131
<PP&E>                                          31,875                  13,625                  13,234
<DEPRECIATION>                                  23,558                   9,031                   9,962
<TOTAL-ASSETS>                                  59,029                  45,571                  33,403
<CURRENT-LIABILITIES>                           11,706                  10,380                   6,511
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                           49,141                  49,292                  49,347
<PREFERRED>                                          0                       0                       0
<COMMON>                                             0                       0                       0
<OTHER-SE>                                     (1,818)                (14,101)                (22,455)
<TOTAL-LIABILITY-AND-EQUITY>                    59,029                  45,571                  33,403
<SALES>                                         51,810                  32,175                  22,248
<TOTAL-REVENUES>                                75,323                  45,296                  26,944
<CGS>                                           27,373                  20,825                  12,722
<TOTAL-COSTS>                                   36,664                  25,670                  15,340
<OTHER-EXPENSES>                                31,388                  32,741                  20,319
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                             (1,437)                 (1,261)                 (1,052)
<INCOME-PRETAX>                                  8,708                (11,854)                 (7,663)
<INCOME-TAX>                                       488                     160                     184
<INCOME-CONTINUING>                              8,220                (12,014)                 (7,847)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     8,220                (12,014)                 (7,847)
<EPS-PRIMARY>                                     0.53                  (0.77)                  (0.51)
<EPS-DILUTED>                                     0.52                  (0.77)                  (0.51)


</TABLE>