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Consolidated Statements Of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net sales $ 361,297 $ 289,323 $ 225,308
COST OF SALES 176,765 139,625 118,698
GROSS PROFIT 184,532 149,698 106,610
OPERATING EXPENSES      
Research and development 71,161 60,949 46,460
Sales and marketing 20,173 16,324 13,597
General and administrative 15,714 13,355 11,250
Amortization of intangible assets 1,051 0 0
Total operating expenses 108,099 90,628 71,307
OPERATING INCOME 76,433 59,070 35,303
NON-OPERATING INCOME (EXPENSES)      
Gain from disposal of short-term investments 3 4 122
Interest income 2,025 2,215 1,845
Foreign exchange gain (loss), net 76 (606) (25)
Interest expense (47) (114) (110)
Other income, net 10 (1) 13
Total non-operating income 2,067 1,498 1,845
INCOME BEFORE INCOME TAX 78,500 60,568 37,148
INCOME TAX EXPENSE 18,249 16,101 9,772
NET INCOME $ 60,251 $ 44,467 $ 27,376
EARNINGS PER ORDINARY SHARE:      
Basic $ 0.44 $ 0.33 $ 0.21
Diluted $ 0.43 $ 0.33 $ 0.20
WEIGHTED AVERAGE ORDINARY SHARES OUTSTANDING      
Basic (Thousands) 138,100 134,604 132,259
Diluted (Thousands) 139,634 136,787 134,567
EARNINGS PER ADS (one ADS equals four ordinary shares):      
Basic $ 1.75 $ 1.32 $ 0.83
Diluted $ 1.73 $ 1.30 $ 0.81
WEIGHTED AVERAGE ADS OUTSTANDING      
Basic (Thousands) 34,525 33,651 33,065
Diluted (Thousands) 34,909 34,197 33,642