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Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) segment | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Segment information |  |  |  |  |
Number of business segments | segment |  |  | 4 |  |
Net sales: |  |  |  |  |
Total net sales revenue | $ 110,551 | $ 116,548 | $ 221,544 | $ 225,182 |
Contribution margin: |  |  |  |  |
Total contribution margin | 44,194 | 49,310 | 89,602 | 93,124 |
Selling, general and administrative expenses | 38,557 | 42,273 | 79,341 | 85,915 |
Operating income | 5,637 | 7,037 | 10,261 | 7,209 |
Other income (loss), net | (1,214) | (1,087) | (1,183) | 427 |
Income before provision for income taxes | 4,423 | 5,950 | 9,078 | 7,636 |
Total property, plant and equipment, net | 44,832 |  | 44,832 |  | $ 45,000
Total assets | 235,831 |  | 235,831 |  | 249,773
China |  |  |  |  |
Contribution margin: |  |  |  |  |
Selling, general and administrative expenses | 3,800 | 5,200 | 6,900 | 8,900 |
United States |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 30,948 | 32,088 | 64,636 | 64,074 |
Contribution margin: |  |  |  |  |
Total property, plant and equipment, net | 39,569 |  | 39,569 |  | 41,239
Taiwan |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 16,308 | 16,041 | 32,100 | 30,216 |
South Korea |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 13,449 | 13,832 | 25,070 | 25,072 |
Other |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 49,846 | 54,587 | 99,738 | 105,820 |
Contribution margin: |  |  |  |  |
Total property, plant and equipment, net | 5,263 |  | 5,263 |  | 3,761
Asia |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 49,984 | 54,875 | 96,204 | 101,220 |
Contribution margin: |  |  |  |  |
Total contribution margin | 23,557 | 26,899 | 45,213 | 48,850 |
Total assets | 98,164 |  | 98,164 |  | 105,636
Asia | General health |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 19,131 | 18,158 | 35,125 | 31,922 |
Asia | Immune |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 2,249 | 1,312 | 3,933 | 1,774 |
Asia | Cardiovascular |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 13,625 | 14,840 | 27,599 | 29,735 |
Asia | Digestive |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 7,707 | 11,564 | 16,296 | 20,986 |
Asia | Personal care |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,044 | 1,442 | 2,336 | 2,783 |
Asia | Weight management |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 6,228 | 7,559 | 10,915 | 14,020 |
Europe |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 21,602 | 21,236 | 43,898 | 42,641 |
Contribution margin: |  |  |  |  |
Total contribution margin | 6,458 | 6,130 | 14,500 | 12,666 |
Total assets | 18,468 |  | 18,468 |  | 20,920
Europe | General health |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 9,534 | 8,615 | 19,336 | 17,789 |
Europe | Immune |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 2,203 | 2,141 | 4,538 | 4,425 |
Europe | Cardiovascular |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 2,296 | 2,302 | 4,715 | 4,821 |
Europe | Digestive |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 5,947 | 6,331 | 11,860 | 12,069 |
Europe | Personal care |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,145 | 1,254 | 2,413 | 2,431 |
Europe | Weight management |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 477 | 593 | 1,036 | 1,106 |
North America |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 33,563 | 34,658 | 70,088 | 69,306 |
Contribution margin: |  |  |  |  |
Total contribution margin | 12,298 | 13,902 | 25,900 | 26,763 |
Total assets | 112,667 |  | 112,667 |  | 116,052
North America | General health |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 15,032 | 15,857 | 31,439 | 31,390 |
North America | Immune |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 3,540 | 3,732 | 7,985 | 8,053 |
North America | Cardiovascular |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 3,757 | 3,761 | 7,741 | 7,349 |
North America | Digestive |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 8,555 | 8,761 | 17,723 | 17,492 |
North America | Personal care |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,581 | 1,634 | 3,153 | 3,098 |
North America | Weight management |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,098 | 913 | 2,047 | 1,924 |
Latin America and Other |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 5,402 | 5,779 | 11,354 | 12,015 |
Contribution margin: |  |  |  |  |
Total contribution margin | 1,881 | 2,379 | 3,989 | 4,845 |
Total assets | 6,532 |  | 6,532 |  | $ 7,165
Latin America and Other | General health |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 1,564 | 1,600 | 3,134 | 3,237 |
Latin America and Other | Immune |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 594 | 668 | 1,317 | 1,412 |
Latin America and Other | Cardiovascular |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 401 | 433 | 883 | 899 |
Latin America and Other | Digestive |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 2,488 | 2,585 | 5,237 | 5,470 |
Latin America and Other | Personal care |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | 270 | 341 | 545 | 692 |
Latin America and Other | Weight management |  |  |  |  |
Net sales: |  |  |  |  |
Total net sales revenue | $ 85 | $ 152 | $ 238 | $ 305 |

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