<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS AS OF JUNE 30, 1997 AND THE CONSOLIDATED STATEMENTS
OF OPERATIONS FOR THE SIX-MONTH PERIOD ENDED JUNE 30, 1997 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                      19,272,000
<SECURITIES>                                         0
<RECEIVABLES>                                1,965,000
<ALLOWANCES>                                 (546,000)
<INVENTORY>                                    159,000
<CURRENT-ASSETS>                               218,000
<PP&E>                                      17,633,000
<DEPRECIATION>                            (13,217,000)
<TOTAL-ASSETS>                              26,993,000
<CURRENT-LIABILITIES>                        6,292,000
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       511,000
<OTHER-SE>                                  18,503,000
<TOTAL-LIABILITY-AND-EQUITY>                26,993,000
<SALES>                                      2,201,000
<TOTAL-REVENUES>                             6,022,000
<CGS>                                                0
<TOTAL-COSTS>                                2,687,000
<OTHER-EXPENSES>                            18,039,000
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             146,000
<INCOME-PRETAX>                           (14,168,000)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                       (14,168,000)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                              (14,168,000)
<EPS-PRIMARY>                                   (0.28)
<EPS-DILUTED>                                        0