<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000
<S> <C> <C> <C> <C>
<PERIOD-TYPE> YEAR YEAR YEAR 3-MOS
<FISCAL-YEAR-END> DEC-31-1999 DEC-31-1998 DEC-31-1997 DEC-31-1999
<PERIOD-START> JAN-01-1999 JAN-01-1998 JAN-01-1997 JAN-01-1999
<PERIOD-END> DEC-31-1999 DEC-31-1998 DEC-31-1997 MAR-31-1999
<CASH> 60,544 4,556 10,972 0
<SECURITIES> 0 2,166 6,415 0
<RECEIVABLES> 5,182 3,241 3,320 0
<ALLOWANCES> (816) (1,840) (121) 0
<INVENTORY> 0 0 0 0
<CURRENT-ASSETS> 69,300 10,742 21,784 0
<PP&E> 7,749 4,561 4,065 0
<DEPRECIATION> (4,264) (3,133) 2,133 0
<TOTAL-ASSETS> 75,683 12,719 24,272 0
<CURRENT-LIABILITIES> 12,695 7,900 9,322 0
<BONDS> 0 0 0 0
0 0 0 0
0 0 7 0
<COMMON> 26 7 7 0
<OTHER-SE> 61,687 4,430 14,804 0
<TOTAL-LIABILITY-AND-EQUITY> 75,683 12,719 24,272 0
<SALES> 16,756 15,463 12,056 3,907
<TOTAL-REVENUES> 16,756 15,463 12,056 3,907
<CGS> 4,903 4,250 4,110 904
<TOTAL-COSTS> 4,903 4,250 4,110 904
<OTHER-EXPENSES> 37,900 23,456 19,897 6,090
<LOSS-PROVISION> 215 1,720 41 48
<INTEREST-EXPENSE> 0 0 0 0
<INCOME-PRETAX> (23,921) (11,719) (11,278) (2,949)
<INCOME-TAX> 301 1 183 (18)
<INCOME-CONTINUING> (24,222) (11,720) (11,461) (2,931)
<DISCONTINUED> 0 0 0 0
<EXTRAORDINARY> 0 0 0 0
<CHANGES> 0 0 0 0
<NET-INCOME> (24,222) (11,720) (11,461) (2,931)
<EPS-BASIC> (1.65) (1.79) (1.90) (0.43)
<EPS-DILUTED> (1.65) (1.79) (1.90) (0.43)
</TABLE>