<ARTICLE> 5
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS AS OF DECEMBER 31, 1997, SEPTEMBER 30, 1997, JUNE
30, 1997 AND MARCH 31, 1997 AND THE RELATED CONSOLIDATED STATEMENTS OF
OPERATIONS FOR THE TWELVE MONTHS IN THE PERIOD ENDED DECEMBER 31, 1997, NINE
MONTHS IN THE PERIOD ENDED SEPTEMBER 30, 1997, SIX MONTHS IN THE PERIOD ENDED
JUNE 30, 1997 AND THREE MONTHS IN THE PERIOD ENDED MARCH 30, 1997 AND ARE
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. SECTION
XI.B.4.b REQUIRES RETROACTIVE RESTATEMENT OF PREVIOUSLY FILED FINANCIAL DATA
SCHEDULES AS A RESULT OF SFAS No. 128, EARNINGS PER SHARE.
</LEGEND>
<RESTATED>
       
                                                                                                       
<PERIOD-TYPE>                                12-MOS                   9-MOS                   6-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-END>                               DEC-31-1997             SEP-30-1997             JUN-30-1997             MAR-30-1997
<CASH>                                          10,784                  10,322                  12,393                   8,397
<SECURITIES>                                     9,677                  10,693                  10,802                  15,505
<RECEIVABLES>                                   10,609                  10,755                  10,943                  10,719
<ALLOWANCES>                                     1,509                   1,972                   2,035                   2,112
<INVENTORY>                                          0                       0                       0                       0
<CURRENT-ASSETS>                                31,554                  31,660                  34,244                  34,500
<PP&E>                                           7,056                   7,040                   7,053                   6,972
<DEPRECIATION>                                   4,651                   4,382                   4,137                   3,941
<TOTAL-ASSETS>                                  34,223                  34,605                  37,459                  37,857
<CURRENT-LIABILITIES>                            8,406                   7,528                   9,576                   7,756
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        39,359                  39,258                  39,096                  39,082
<OTHER-SE>                                    (13,675)                (12,325)                (11,369)                 (9,150)
<TOTAL-LIABILITY-AND-EQUITY>                    34,223                  34,605                  37,459                  37,857
<SALES>                                         22,018                  15,376                   9,189                   3,834
<TOTAL-REVENUES>                                22,018                  15,376                   9,189                   3,834
<CGS>                                            2,863                   1,743                     935                     430
<TOTAL-COSTS>                                    5,667                   3,769                   2,208                     988
<OTHER-EXPENSES>                                25,419                  19,013                  13,114                   6,361
<LOSS-PROVISION>                                   382                     251                     218                     107
<INTEREST-EXPENSE>                             (1,170)                   (893)                   (616)                   (308)
<INCOME-PRETAX>                                (7,859)                 (6,420)                 (5,408)                 (3,169)
<INCOME-TAX>                                        45                      22                      19                       8
<INCOME-CONTINUING>                            (7,904)                 (6,442)                 (5,427)                 (3,177)
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                   (7,904)                 (6,442)                 (5,427)                 (3,177)
<EPS-PRIMARY>                                   (0.83)                  (0.69)                  (0.58)                  (0.34)
<EPS-DILUTED>                                   (0.83)                  (0.69)                  (0.58)                  (0.34)