Three Months Ended
                                                             June 30,
                                                     1998                1997
                                                   -----------------------------

Net revenues                                       $178,221            $123,712
Cost of goods sold                                   87,589              62,312
                                                   --------            --------
     Gross profit                                    90,632              61,400
                                                   --------            --------

Operating expenses:
   Marketing and sales                               33,644              26,636
   General and administrative                        15,417              11,889
   Research and development                          36,242              27,682
   Charge for acquired in-process technology          2,279                   -
                                                   --------            --------
       Total operating expenses                      87,582              66,207
                                                   --------            --------
     Operating income (loss)                          3,050              (4,807)
Interest and other income, net                        2,815               2,550
                                                   --------            --------
     Income (loss) before provision for income
       taxes and minority interest                    5,865              (2,257)
Provision (benefit) for income taxes                  1,935                (778)
                                                   --------            --------
     Income (loss) before minority interest           3,930              (1,479)
Minority interest in consolidated
  joint venture                                        (230)                 28
                                                   --------            --------
      Net income (loss)                            $  3,700            $ (1,451)
                                                   ========            =========

Net income (loss) per share:
Basic                                              $   0.06            $  (0.02)
                                                   ========            =========
Diluted                                            $   0.06            $  (0.02)
                                                   ========            =========

Number of shares used in computation:
Basic                                                60,304              58,317
                                                   ========            =========
Diluted                                              62,996              58,317
                                                   ========            =========