<ARTICLE>                                                             5
<LEGEND>                      
               THESE SCHEDULES CONTAIN SUMMARY FINANCIAL  INFORMATION  EXTRACTED
               FROM THE  CONSOLIDATED  BALANCE  SHEETS AS OF DECEMBER  31, 1996,
               MARCH 31,  1997,  MARCH  31,  1998 AND THE  RELATED  CONSOLIDATED
               STATEMENTS OF OPERATIONS  FOR THE TWELVE MONTHS IN THE YEAR ENDED
               DECEMBER  31, 1996,  THE THREE MONTHS IN THE PERIODS  ENDED MARCH
               31,  1997  AND  1998  AND ARE  QUALIFIED  IN  THEIR  ENTIRETY  BY
               REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                       1,000
       
                                                                            
<PERIOD-TYPE>                                      3-MOS                3-MOS               YEAR
<FISCAL-YEAR-END>                            DEC-31-1998          DEC-31-1997        DEC-31-1996
<PERIOD-END>                                 MAR-31-1998          MAR-31-1997        DEC-31-1996
<CASH>                                            22,536               37,117             39,322
<SECURITIES>                                           0                    0                  0
<RECEIVABLES>                                     17,448               19,229             13,841
<ALLOWANCES>                                      12,274                2,482              1,523
<INVENTORY>                                        3,667                1,560              2,365
<CURRENT-ASSETS>                                  36,832               56,137             55,460
<PP&E>                                             5,588                1,632              1,265
<DEPRECIATION>                                     1,388                  383                275
<TOTAL-ASSETS>                                    41,248               57,386             56,450
<CURRENT-LIABILITIES>                             18,526               12,575             12,733
<BONDS>                                                0                    0                  0
<COMMON>                                          59,040               52,464             52,702
<PREFERRED-MANDATORY>                                  0                    0                  0
<PREFERRED>                                            0                    0                  0
<OTHER-SE>                                       (37,151)              (7,702)            (9,034)
<TOTAL-LIABILITY-AND-EQUITY>                      41,248               57,386             56,450
<SALES>                                            4,697               16,533             38,524
<TOTAL-REVENUES>                                   4,697               16,533             38,524
<CGS>                                              1,281                4,213             11,991
<TOTAL-COSTS>                                      1,281                4,213             11,991
<OTHER-EXPENSES>                                  19,737               10,670             30,366
<LOSS-PROVISION>                                       0                   20                  0
<INTEREST-EXPENSE>                                  (280)                (521)              (351)
<INCOME-PRETAX>                                  (16,041)                2,171            (3,482)
<INCOME-TAX>                                           8                  839                  1
<INCOME-CONTINUING>                              (16,049)                1,332            (3,483)
<DISCONTINUED>                                         0                    0                  0
<EXTRAORDINARY>                                        0                    0                  0
<CHANGES>                                              0                    0                  0
<NET-INCOME>                                     (16,049)                1,332            (3,483)
<EPS-PRIMARY>                                         (1.27)                 0.11             (0.88)
<EPS-DILUTED>                                         (1.27)                 0.10             (0.88)