<TABLE> <S> <C>

<ARTICLE>                     5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS INCLUDED IN THE RESPECTIVE FORM 10-Q FOR THE QUARTERS ENDED
SEPTEMBER 30, 1997, JUNE 30, 1997 AND MARCH 31, 1997 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<CURRENCY> U.S. DOLLARS

<S>                                                    <C>              <C>               <C>
<PERIOD-TYPE>                                          9-MOS            6-MOS             3-MOS
<FISCAL-YEAR-END>                                DEC-31-1997      DEC-31-1997       DEC-31-1997
<PERIOD-START>                                   JUL-01-1997      APR-01-1997       JAN-01-1997
<PERIOD-END>                                     SEP-30-1997      JUN-30-1997       MAR-31-1997
<EXCHANGE-RATE>                                            1                1                 1
<CASH>                                                13,848           11,797            12,630
<SECURITIES>                                           2,722            7,016             8,484
<RECEIVABLES>                                         15,679           12,462            10,129
<ALLOWANCES>                                             800              928               898
<INVENTORY>                                                0                0                 0
<CURRENT-ASSETS>                                      32,835           32,633            33,143
<PP&E>                                                11,721           10,703             9,988
<DEPRECIATION>                                         7,718            7,118             6,643
<TOTAL-ASSETS>                                        39,751           37,854            37,847
<CURRENT-LIABILITIES>                                  9,514            8,183             9,107
<BONDS>                                                  212              212               114
<PREFERRED-MANDATORY>                                      0                0                 0
<PREFERRED>                                                0                0                 0
<COMMON>                                                  27               27                27
<OTHER-SE>                                            29,998           29,432            28,599
<TOTAL-LIABILITY-AND-EQUITY>                          39,751           37,854            37,847
<SALES>                                               24,747           14,905             6,625
<TOTAL-REVENUES>                                      35,345           22,330            11,155
<CGS>                                                  1,122              803               388
<TOTAL-COSTS>                                          7,464            4,860             2,424
<OTHER-EXPENSES>                                      26,533           16,737             8,082
<LOSS-PROVISION>                                           0                0                 0
<INTEREST-EXPENSE>                                         0                0                 0
<INCOME-PRETAX>                                        2,395            1,470               975
<INCOME-TAX>                                              97               97                49
<INCOME-CONTINUING>                                    2,298            1,373               926
<DISCONTINUED>                                             0                0                 0
<EXTRAORDINARY>                                            0                0                 0
<CHANGES>                                                  0                0                 0
<NET-INCOME>                                           2,298            1,373               926
<EPS-PRIMARY>                                           0.09             0.05              0.03
<EPS-DILUTED>                                           0.08             0.05              0.03


</TABLE>