<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   9-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1996             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               DEC-31-1996             SEP-30-1997             SEP-30-1996
<CASH>                                          15,446                  14,026                   6,250
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                    8,960                  14,664                   4,931
<ALLOWANCES>                                        40                      40                      40
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                26,569                  29,781                  12,004
<PP&E>                                           2,386                   2,928                   2,214
<DEPRECIATION>                                   1,462                   1,804                   1,333
<TOTAL-ASSETS>                                  28,168                  31,796                  13,531
<CURRENT-LIABILITIES>                            7,248                   8,869                   6,619
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                           109                     110                      85
<OTHER-SE>                                      18,801                  21,485                   6,631
<TOTAL-LIABILITY-AND-EQUITY>                    28,168                  31,796                  13,531
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                                17,715                  19,586                  12,796
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                        0                       0                       0
<OTHER-EXPENSES>                                16,499                  17,107                  11,942
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                               (324)                   (684)                   (213)
<INCOME-PRETAX>                                  1,540                   3,163                   1,067
<INCOME-TAX>                                       465                   1,043                     383
<INCOME-CONTINUING>                              1,075                   2,120                     684
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     1,075                   2,120                     684
<EPS-PRIMARY>                                     0.13                    0.19                    0.08
<EPS-DILUTED>                                     0.12                    0.18                    0.07


</TABLE>