<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000

<S>                                        <C>                    <C>                     <C>                     <C>
<PERIOD-TYPE>                              YEAR                   YEAR                    3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1995             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1996             JAN-01-1995             JAN-01-1997             APR-01-1997
<PERIOD-END>                               DEC-31-1996             DEC-31-1995             MAR-31-1997             JUN-30-1997
<CASH>                                          21,605                  54,038                  13,551                  19,587
<SECURITIES>                                    44,688                  23,683                  50,177                  33,227
<RECEIVABLES>                                   21,173                  11,343                  16,774                  20,851
<ALLOWANCES>                                     4,554                   3,805                       0                       0
<INVENTORY>                                      1,512                   2,132                   1,716                   1,790
<CURRENT-ASSETS>                                91,077                  91,882                  89,967                  84,467
<PP&E>                                           8,361                   3,903                   9,605                  10,324
<DEPRECIATION>                                   2,780                   1,368                   3,040                   3,523
<TOTAL-ASSETS>                                  97,935                  94,913                  97,746                  92,708
<CURRENT-LIABILITIES>                           11,823                  11,747                  11,452                  13,250
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                            22                      21                      22                      23
<OTHER-SE>                                      86,090                  82,895                  86,272                  79,035
<TOTAL-LIABILITY-AND-EQUITY>                    97,935                  94,913                  97,746                  92,708
<SALES>                                         62,936                  46,260                  13,252                  18,749
<TOTAL-REVENUES>                                62,936                  46,260                  13,252                  18,749
<CGS>                                           11,677                  10,081                   2,668                   3,563
<TOTAL-COSTS>                                   11,677                  10,081                   2,668                   3,563
<OTHER-EXPENSES>                                60,090                  32,560                  12,022                  29,705
<LOSS-PROVISION>                                   597                     495                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0                       0
<INCOME-PRETAX>                                (5,434)                   4,253                   (627)                (13,741)
<INCOME-TAX>                                     2,216                   1,827                   (195)                 (1,387)
<INCOME-CONTINUING>                            (7,650)                   2,426                   (432)                (12,354)
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                   (7,650)                   2,426                   (432)                (12,354)
<EPS-PRIMARY>                                   (0.37)                    0.18                  (0.02)                  (0.54)
<EPS-DILUTED>                                   (0.37)                    0.15                  (0.02)                  (0.54)


</TABLE>