<ARTICLE> 5
<MULTIPLIER> 1,000

                                                                       
<PERIOD-TYPE>                   YEAR                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1998             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               DEC-31-1998             DEC-01-1997             DEC-31-1996
<CASH>                                          51,900                  63,395                  13,617
<SECURITIES>                                    37,901                  30,282                   4,857
<RECEIVABLES>                                    6,493                  13,365                   5,344
<ALLOWANCES>                                     1,344                     986                     540
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                98,396                 111,542                  26,827
<PP&E>                                          12,886                   8,806                   3,462
<DEPRECIATION>                                   6,506                   2,753                     783
<TOTAL-ASSETS>                                 128,774                 119,469                  31,346
<CURRENT-LIABILITIES>                           40,650                  24,326                   8,061
<BONDS>                                            987                     963                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                      4,842                   4,842                  23,153
<COMMON>                                            62                      55                       1
<OTHER-SE>                                      76,400                  73,783                     133
<TOTAL-LIABILITY-AND-EQUITY>                   128,774                 119,469                  31,346
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                                66,377                  36,391                  21,583
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                   12,666                   7,112                   3,749
<OTHER-EXPENSES>                                77,799                  46,240                  22,221
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0
<INCOME-PRETAX>                               (19,953)                (15,069)                 (4,065)
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                           (19,953)                (15,069)                 (4,065)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                  (19,953)                (15,069)                 (4,065)
<EPS-BASIC>                                      (.31)                  (1.84)                  (4.23)
<EPS-DILUTED>                                    (.31)                  (1.84)                  (4.23)