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Consolidated Statements Of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
NET SALES $ 539,521 $ 457,253 $ 530,348 [1]
COST OF SALES 279,365 235,081 269,541
GROSS PROFIT 260,156 222,172 260,807
OPERATING EXPENSES      
Research and development 121,784 110,305 102,028
Sales and marketing 24,805 25,108 29,279
General and administrative 15,604 17,878 17,633
Impairment of goodwill and intangible assets 17,489 15,970 4,069
Amortization of intangible assets 0 766 2,964
Total operating expenses 179,682 170,027 155,973
OPERATING INCOME 80,474 52,145 104,834
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 48 134
Interest income 4,636 6,751 6,301
Foreign exchange gain (loss), net 619 148 (615)
Interest expense (11) (3) (378)
Loss on equity-method investment     (473)
Other income (loss), net (36) 103 58
Total non-operating income 5,084 19,929 5,027
INCOME BEFORE INCOME TAX 85,558 72,074 109,861
INCOME TAX EXPENSE 5,812 7,676 11,791
NET INCOME $ 79,746 $ 64,398 $ 98,070
EARNINGS PER ORDINARY SHARE:      
Basic $ 0.57 $ 0.46 $ 0.68
Diluted $ 0.57 $ 0.46 $ 0.68
WEIGHTED AVERAGE ORDINARY SHARES OUTSTANDING      
Basic (Thousands) 139,421 140,708 144,123
Diluted (Thousands) 139,910 141,183 144,512
EARNINGS PER ADS (one ADS equals four ordinary shares):      
Basic $ 2.29 $ 1.83 $ 2.72
Diluted $ 2.28 $ 1.82 $ 2.71
WEIGHTED AVERAGE ADS OUTSTANDING      
Basic (Thousands) 34,855 35,177 36,031
Diluted (Thousands) 34,978 35,296 36,128
[1] In 2019 and 2020, revenue billed to Japan was reclassified to others.