<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS AS OF MARCH 31, 1997 AND THE CONSOLIDATED STATEMENTS
OF OPERATIONS FOR THE THREE MONTH PERIOD ENDED MARCH 31, 1997 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                       4,596,000
<SECURITIES>                                22,154,000
<RECEIVABLES>                                3,772,000
<ALLOWANCES>                                  (546,000)
<INVENTORY>                                    237,000
<CURRENT-ASSETS>                               303,000
<PP&E>                                      17,470,000
<DEPRECIATION>                             (12,834,000)
<TOTAL-ASSETS>                              36,661,000
<CURRENT-LIABILITIES>                        9,643,000
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       511,000
<OTHER-SE>                                  24,756,000
<TOTAL-LIABILITY-AND-EQUITY>                36,661,000
<SALES>                                        870,000
<TOTAL-REVENUES>                             3,854,000
<CGS>                                                0
<TOTAL-COSTS>                                1,141,000
<OTHER-EXPENSES>                            10,747,000
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              73,000
<INCOME-PRETAX>                             (7,724,000)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                         (7,724,000)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                (7,724,000)
<EPS-PRIMARY>                                    (0.15)
<EPS-DILUTED>                                        0