<TABLE> <S> <C>

<ARTICLE>  5
<LEGEND>   This schedule contains summary financial information extracted
           from the Consolidated Balance Sheet and Consolidated Statement 
           of Operations included in the Company's Form 10-K for the year 
           ended December 31, 1998, 1997 and 1996, and is qualified in its
           entirety by reference to such Consolidated Financial Statements.
</LEGEND> 
<MULTIPLIER> 1,000 
       
<S>                                  <C>            <C>            <C>
<FISCAL-YEAR-END>                    Dec-31-1998    Dec-31-1997    Dec-31-1996
<PERIOD-START>                       Jan-01-1998    Jan-01-1997    Jan-01-1996
<PERIOD-END>                         Dec-31-1998    Dec-31-1997    Dec-31-1996
<PERIOD-TYPE>                        12-MOS         12-MOS         12-MOS
<CASH>                                 51,533,655     22,553,988    20,155,935
<SECURITIES>                                    0              0             0
<RECEIVABLES>                          16,796,264      9,610,762     5,392,177
<ALLOWANCES>                            1,721,625        461,000       100,000
<INVENTORY>                                     0              0             0
<CURRENT-ASSETS>                       70,969,134     34,437,820    26,388,803
<PP&E>                                 28,064,836     26,713,782    14,092,323
<DEPRECIATION>                         12,739,324      7,160,245     2,349,032
<TOTAL-ASSETS>                         88,354,452     58,261,678    39,841,869
<CURRENT-LIABILITIES>                  11,181,985     15,007,059     6,166,172
<BONDS>                                         0              0             0
<PREFERRED-MANDATORY>                           0              0             0
<PREFERRED>                                     0              0             0
<COMMON>                                    3,412          2,936         2,656
<OTHER-SE>                             76,599,810     40,639,868    33,095,498
<TOTAL-LIABILITY-AND-EQUITY>           88,354,452     58,261,678    39,841,869
<SALES>                                56,432,080     33,639,589    14,830,348
<TOTAL-REVENUES>                       56,432,080     33,639,589    14,830,348
<CGS>                                  30,032,348     26,717,075    15,333,504
<TOTAL-COSTS>                          30,032,348     26,717,075    15,333,504
<OTHER-EXPENSES>                       23,869,789     41,060,385    15,032,155
<LOSS-PROVISION>                                0              0             0
<INTEREST-EXPENSE>                     (1,415,616)      (611,473)     (451,948)
<INCOME-PRETAX>                         2,599,957    (24,728,092)  (16,948,662)
<INCOME-TAX>                                    0              0             0
<INCOME-CONTINUING>                     2,599,957    (24,728,092)  (16,948,662)
<DISCONTINUED>                                  0              0             0
<EXTRAORDINARY>                                 0              0             0
<CHANGES>                                       0              0             0
<NET-INCOME>                            2,599,957    (24,728,092)  (16,948,662)
<EPS-PRIMARY>                               $0.08         ($0.91)       ($1.06)
<EPS-DILUTED>                               $0.07         ($0.91)       ($1.06)
<FN>
<F1> EPS-Basic and EPS-Diluted for 1996 has been restated to comply
     with SFAS 128.
</FN>
        

</TABLE>