<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                           7,272                   5,058                   4,205
<SECURITIES>                                     5,365                   5,004                   5,465
<RECEIVABLES>                                    3,227                   3,107                   2,332
<ALLOWANCES>                                       148                     121                     121
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                16,160                  13,856                  12,701
<PP&E>                                           3,153                   3,311                   3,453
<DEPRECIATION>                                   1,280                   1,454                   1,633
<TOTAL-ASSETS>                                  19,033                  16,657                  15,384
<CURRENT-LIABILITIES>                            5,741                   5,772                   5,676
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                           103                     104                     104
<OTHER-SE>                                      12,648                  10,320                   9,149
<TOTAL-LIABILITY-AND-EQUITY>                    19,033                  16,657                  15,384
<SALES>                                          1,364                   2,420                   4,509
<TOTAL-REVENUES>                                 2,661                   4,921                   8,022
<CGS>                                              281                     499                     821
<TOTAL-COSTS>                                    1,113                   2,150                   3,128
<OTHER-EXPENSES>                                 3,483                   7,496                  10,954
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                 121                     255                     365
<INCOME-PRETAX>                                (1,834)                 (4,470)                 (5,695)
<INCOME-TAX>                                        65                      64                     139
<INCOME-CONTINUING>                            (1,899)                 (4,534)                 (5,834)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                   (1,899)                 (4,534)                 (5,834)
<EPS-PRIMARY>                                   (0.18)                  (0.44)                  (0.56)
<EPS-DILUTED>                                   (0.18)                  (0.44)                  (0.56)
        

</TABLE>