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OPERATING BUSINESS SEGMENT AND INTERNATIONAL OPERATION INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales | $ 101,743 | $ 100,250 | $ 87,286 | $ 95,926 | $ 91,695 | $ 88,524 | $ 90,724 | $ 91,272 | $ 385,205 | $ 362,215
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 152,779 | 144,865
Selling, general and administrative | 38,434 | 33,294 | 28,504 | 31,065 | 32,692 | 31,177 | 31,019 | 33,852 | 131,297 | 128,740
Operating income | 2,249 | 5,471 | 6,600 | 7,162 | 3,908 | 4,701 | 4,538 | 2,978 | 21,482 | 16,125
Other income (loss), net | 1,569 | $ 671 | $ 1,509 | $ (2,410) | 502 | $ (1,243) | $ 306 | $ (48) | 1,339 | (483)
Income from operations before provision for income taxes |  |  |  |  |  |  |  |  | 22,821 | 15,642
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 4,905 | 5,915
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 10,743 | 10,599
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | 249,498 |  |  |  | 213,068 |  |  |  | 249,498 | 213,068
Property, plant and equipment |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment | 54,355 |  |  |  | 59,512 |  |  |  | 54,355 | 59,512
Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |
Contribution margin: |  |  |  |  |  |  |  |  |  |
Service fees |  |  |  |  |  |  |  |  | 11,700 | 9,400
United States |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 134,976 | 128,019
Property, plant and equipment |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment | 50,025 |  |  |  | 54,470 |  |  |  | 50,025 | 54,470
South Korea |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 62,041 | 70,556
Other |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 188,188 | 163,640
Property, plant and equipment |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment | 4,330 |  |  |  | 5,042 |  |  |  | 4,330 | 5,042
Asia |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 138,717 | 138,536
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 66,801 | 65,871
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 542 | 3,262
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 1,919 | 1,544
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | 82,572 |  |  |  | 65,959 |  |  |  | 82,572 | 65,959
Asia | General health |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 36,445 | 37,795
Asia | Immunity |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 847 | 940
Asia | Cardiovascular |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 40,496 | 44,541
Asia | Digestive |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 32,605 | 24,434
Asia | Personal care |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 10,606 | 13,753
Asia | Weight management |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 17,718 | 17,073
Europe |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 77,688 | 62,523
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 26,014 | 19,954
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 34 | 27
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 77 | 75
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | 16,398 |  |  |  | 15,187 |  |  |  | 16,398 | 15,187
Europe | General health |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 32,822 | 22,469
Europe | Immunity |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 8,231 | 5,130
Europe | Cardiovascular |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 10,863 | 10,672
Europe | Digestive |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 18,673 | 14,456
Europe | Personal care |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 4,663 | 7,463
Europe | Weight management |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,436 | 2,333
North America |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 145,481 | 138,163
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 50,193 | 49,327
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 4,267 | 2,605
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 8,673 | 8,855
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | 142,324 |  |  |  | 124,337 |  |  |  | 142,324 | 124,337
North America | General health |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 61,897 | 59,847
North America | Immunity |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 23,036 | 15,341
North America | Cardiovascular |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 15,852 | 18,750
North America | Digestive |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 32,851 | 33,077
North America | Personal care |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 7,587 | 6,170
North America | Weight management |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 4,258 | 4,978
Latin America and Other |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 23,319 | 22,993
Contribution margin: |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 9,771 | 9,713
Capital expenditures: |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 62 | 21
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 74 | 125
Assets: |  |  |  |  |  |  |  |  |  |
Total assets | $ 8,204 |  |  |  | $ 7,585 |  |  |  | 8,204 | 7,585
Latin America and Other | General health |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 6,867 | 6,919
Latin America and Other | Immunity |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 3,122 | 2,453
Latin America and Other | Cardiovascular |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,512 | 1,446
Latin America and Other | Digestive |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 9,863 | 10,258
Latin America and Other | Personal care |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,203 | 1,056
Latin America and Other | Weight management |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 752 | $ 861

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