<ARTICLE> 5
<CURRENCY> U.S. DOLLAR
       
                                     
<PERIOD-TYPE>                                    6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<EXCHANGE-RATE>                                      1
<CASH>                                           4,473
<SECURITIES>                                    36,024
<RECEIVABLES>                                    3,359
<ALLOWANCES>                                       347
<INVENTORY>                                          0
<CURRENT-ASSETS>                                   364
<PP&E>                                           7,420
<DEPRECIATION>                                   4,864
<TOTAL-ASSETS>                                  46,429
<CURRENT-LIABILITIES>                            8,395
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        68,579
<OTHER-SE>                                    (30,545)
<TOTAL-LIABILITY-AND-EQUITY>                    46,429
<SALES>                                         13,205
<TOTAL-REVENUES>                                15,600
<CGS>                                              689
<TOTAL-COSTS>                                    1,852
<OTHER-EXPENSES>                                11,828
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,065
<INCOME-PRETAX>                                  2,985
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                              2,985
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,985
<EPS-PRIMARY>                                      .24
<EPS-DILUTED>                                      .21