<ARTICLE> 5
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1995
<PERIOD-START>                             JAN-01-1996             JAN-01-1995
<PERIOD-END>                               MAR-31-1996             MAR-31-1995
<CASH>                                          31,446                  30,417
<SECURITIES>                                    17,357                  36,211
<RECEIVABLES>                                   23,624                  32,387
<ALLOWANCES>                                     1,600                   1,600
<INVENTORY>                                        894                   1,063
<CURRENT-ASSETS>                                94,622                 112,070
<PP&E>                                          19,651                  18,703
<DEPRECIATION>                                       0                       0
<TOTAL-ASSETS>                                 183,091                 189,968
<CURRENT-LIABILITIES>                           25,322                  24,339
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           270                     265
<OTHER-SE>                                     182,821                 164,543
<TOTAL-LIABILITY-AND-EQUITY>                   183,091                 189,968
<SALES>                                         24,974                  28,661
<TOTAL-REVENUES>                                29,004                  31,314
<CGS>                                            2,576                   1,948
<TOTAL-COSTS>                                    5,226                   4,311
<OTHER-EXPENSES>                                38,207                  15,487
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                               (13,400)                  12,559
<INCOME-TAX>                                   (4,958)                   4,709
<INCOME-CONTINUING>                            (8,442)                   7,850
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (8,442)                   7,850
<EPS-PRIMARY>                                        0                       0
<EPS-DILUTED>                                   (0.31)                    0.27