<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED BALANCE SHEETS STATEMENTS OF OPERATIONS AND STATEMENTS OF CASH FLOWS
INCLUDED IN THE COMPANY'S FORM 10-Q FOR THE PERIOD ENDED MARCH 31, 1997 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS AND THE
NOTES THERETO.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                           8,658
<SECURITIES>                                    37,774
<RECEIVABLES>                                    7,369
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                57,064
<PP&E>                                          21,369
<DEPRECIATION>                                (14,756)
<TOTAL-ASSETS>                                  63,677
<CURRENT-LIABILITIES>                           17,379
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             2
<OTHER-SE>                                      42,960
<TOTAL-LIABILITY-AND-EQUITY>                    63,677
<SALES>                                              0
<TOTAL-REVENUES>                                 6,325
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                14,538
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 171
<INCOME-PRETAX>                                (7,675)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (7,675)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (7,675)
<EPS-PRIMARY>                                   (0.38)
<EPS-DILUTED>                                   (0.38)