<TABLE> <S> <C>

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

<S>                                       <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                             3-MOS                   3-MOS                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1996             DEC-31-1996
<PERIOD-START>                             JUL-01-1997             OCT-01-1997             JAN-01-1996             APR-01-1996
<PERIOD-END>                               SEP-30-1997             DEC-31-1997             MAR-31-1996             JUN-30-1996
<CASH>                                          11,409                   9,653                  53,561                  20,724
<SECURITIES>                                    40,873                  40,349                  22,947                  55,033
<RECEIVABLES>                                   25,343                  26,604                   7,528                  10,016
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                      1,569                   1,667                   2,077                   1,787
<CURRENT-ASSETS>                                87,731                  87,725                  91,190                  92,203
<PP&E>                                          11,240                  12,348                   4,509                   6,130
<DEPRECIATION>                                   4,071                   4,771                   1,643                   1,928
<TOTAL-ASSETS>                                  96,486                  97,290                  93,482                  97,035
<CURRENT-LIABILITIES>                           11,664                  10,048                  10,053                  11,427
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                            23                      24                      21                      21
<OTHER-SE>                                      84,799                  87,218                  83,406                  85,156
<TOTAL-LIABILITY-AND-EQUITY>                    96,486                  97,290                  93,482                  97,035
<SALES>                                         21,008                  16,065                  13,983                  14,854
<TOTAL-REVENUES>                                21,008                  16,065                  13,983                  14,854
<CGS>                                            3,023                   2,605                   2,693                   2,718
<TOTAL-COSTS>                                    3,023                   2,605                   2,693                   2,718
<OTHER-EXPENSES>                                13,588                  13,445                  11,327                  10,468
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0                       0
<INCOME-PRETAX>                                  5,224                     756                     851                   2,527
<INCOME-TAX>                                     1,619                   (247)                     576                     767
<INCOME-CONTINUING>                              3,605                   1,003                     275                   1,760
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     3,605                   1,003                     275                   1,760
<EPS-PRIMARY>                                     0.16                    0.04                    0.01                    0.09
<EPS-DILUTED>                                     0.15                    0.04                    0.01                    0.08


</TABLE>