<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-31-1997             DEC-31-1996             DEC-31-1995             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1996             JAN-01-1995             JAN-01-1997
<PERIOD-END>                               DEC-31-1997             DEC-31-1996             DEC-31-1995             MAR-31-1997
<CASH>                                          12,827                  15,531                   5,690                  17,675
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                   15,676                   9,064                   4,685                   6,935
<ALLOWANCES>                                       543                      43                      43                      43
<INVENTORY>                                          0                       0                       0                       0
<CURRENT-ASSETS>                                29,450                  26,550                  11,300                  25,823
<PP&E>                                           3,932                   2,617                   2,063                   2,659
<DEPRECIATION>                                   2,113                   1,599                   1,131                   1,640
<TOTAL-ASSETS>                                  33,222                  28,243                  12,593                  27,494
<CURRENT-LIABILITIES>                            8,761                   7,785                   7,295                   6,675
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                           112                     109                      85                     110
<OTHER-SE>                                      23,121                  18,281                   4,557                  18,925
<TOTAL-LIABILITY-AND-EQUITY>                    33,222                  28,243                  12,593                  27,494
<SALES>                                              0                       0                       0                       0
<TOTAL-REVENUES>                                28,891                  18,513                  18,497                   5,380
<CGS>                                                0                       0                       0                       0
<TOTAL-COSTS>                                        0                       0                       0                       0
<OTHER-EXPENSES>                                24,683                  16,763                  16,509                   4,855
<LOSS-PROVISION>                                   500                       0                       0                       0
<INTEREST-EXPENSE>                               (863)                   (269)                    (43)                   (217)
<INCOME-PRETAX>                                  5,071                   2,019                   2,031                     742
<INCOME-TAX>                                     1,572                     609                     871                     241
<INCOME-CONTINUING>                              3,499                   1,410                   1,160                     501
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     3,499                   1,410                   1,160                     501
<EPS-PRIMARY>                                     0.32                    0.16                    0.14                    0.05
<EPS-DILUTED>                                     0.29                    0.15                    0.12                    0.04
        

</TABLE>