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Consolidated Statements Of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net sales $ 556,146 $ 361,297 $ 289,323
COST OF SALES 281,541 176,765 139,625
GROSS PROFIT 274,605 184,532 149,698
OPERATING EXPENSES      
Research and development 92,405 71,161 60,949
Sales and marketing 25,765 20,173 16,324
General and administrative 17,072 15,714 13,355
Amortization of intangible assets 2,103 1,051 0
Total operating expenses 137,345 108,099 90,628
OPERATING INCOME 137,260 76,433 59,070
NON-OPERATING INCOME (EXPENSES)      
Gain from disposal of short-term investments 2 3 4
Interest income 2,158 2,025 2,215
Foreign exchange gain (loss), net (692) 76 (606)
Impairment of long-term investments (13)    
Interest expense (127) (47) (114)
Other income, net 42 10 (1)
Total non-operating income 1,370 2,067 1,498
INCOME BEFORE INCOME TAX 138,630 78,500 60,568
INCOME TAX EXPENSE 27,690 18,249 16,101
NET INCOME $ 110,940 $ 60,251 $ 44,467
EARNINGS PER ORDINARY SHARE:      
Basic $ 0.79 $ 0.44 $ 0.33
Diluted $ 0.78 $ 0.43 $ 0.33
WEIGHTED AVERAGE ORDINARY SHARES OUTSTANDING      
Basic (Thousands) 140,919 138,100 134,604
Diluted (Thousands) 142,050 139,634 136,787
EARNINGS PER ADS (one ADS equals four ordinary shares):      
Basic $ 3.15 $ 1.75 $ 1.32
Diluted $ 3.12 $ 1.73 $ 1.30
WEIGHTED AVERAGE ADS OUTSTANDING      
Basic (Thousands) 35,230 34,525 33,651
Diluted (Thousands) 35,513 34,909 34,197