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Consolidated Statements Of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
NET SALES $ 922,100 $ 539,521 $ 457,253
COST OF SALES 461,305 279,365 235,081
GROSS PROFIT 460,795 260,156 222,172
OPERATING EXPENSES      
Research and development 164,291 121,784 110,305
Sales and marketing 28,813 24,805 25,108
General and administrative 21,822 15,604 17,878
Impairment of goodwill and intangible assets 0 17,489 15,970
Amortization of intangible assets 0 0 766
Total operating expenses 214,926 179,682 170,027
OPERATING INCOME 245,869 80,474 52,145
NON-OPERATING INCOME (EXPENSES)      
Gain (loss) from disposal of subsidiary   (293) 12,409
Gain from disposal of long-term investments     473
Gain from disposal of short-term investments   169 48
Interest income 1,279 4,636 6,751
Foreign exchange gain, net 193 619 148
Interest expense   (11) (3)
Other income (loss), net (77) (36) 103
Total non-operating income 1,395 5,084 19,929
INCOME BEFORE INCOME TAX 247,264 85,558 72,074
INCOME TAX EXPENSE 47,262 5,812 7,676
NET INCOME $ 200,002 $ 79,746 $ 64,398
EARNINGS PER ORDINARY SHARE:      
Basic $ 1.43 $ 0.57 $ 0.46
Diluted $ 1.43 $ 0.57 $ 0.46
WEIGHTED AVERAGE ORDINARY SHARES OUTSTANDING      
Basic (Thousands) 139,405 139,421 140,708
Diluted (Thousands) 139,968 139,910 141,183
EARNINGS PER ADS (one ADS equals four ordinary shares):      
Basic $ 5.74 $ 2.29 $ 1.83
Diluted $ 5.72 $ 2.28 $ 1.82
WEIGHTED AVERAGE ADS OUTSTANDING      
Basic (Thousands) 34,851 34,855 35,177
Diluted (Thousands) 34,992 34,978 35,296