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OPERATING BUSINESS SEGMENT AND INTERNATIONAL OPERATION INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales | $ 97,374 | $ 88,828 | $ 91,266 | $ 87,342 | $ 88,286 | $ 89,301 | $ 81,344 | $ 83,098 | $ 364,810 | $ 342,029 | $ 341,159
Contribution margin: |  |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 143,782 | 131,022 | 130,312
Selling, general and administrative | 41,092 | 31,643 | 33,310 | 32,386 | 34,537 | 32,926 | 31,836 | 30,336 | 138,431 | 129,635 | 120,273
Operating income | (1,229) | 3,513 | 2,186 | 881 | (2,841) | 2,154 | 23 | 2,051 | 5,351 | 1,387 | 10,039
Other income (loss), net | (731) | $ (353) | $ (1,807) | $ 740 | (74) | $ 193 | $ 441 | $ 1,275 | (2,151) | 1,835 | (773)
Income from continuing operations before provision for income taxes |  |  |  |  |  |  |  |  | 3,200 | 3,222 | 9,266
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 4,803 | 5,386 | 10,124
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 9,806 | 8,634 | 4,808
Assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 193,016 |  |  |  | 195,195 |  |  |  | 193,016 | 195,195 |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment | 64,061 |  |  |  | 69,106 |  |  |  | 64,061 | 69,106 |
United States |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 133,677 | 140,860 | 148,060
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment | 60,606 |  |  |  | 65,928 |  |  |  | 60,606 | 65,928 |
South Korea |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 72,207 | 52,020 | 57,637
Other |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 158,926 | 149,149 | 135,462
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |
Total property, plant and equipment | 3,455 |  |  |  | 3,178 |  |  |  | 3,455 | 3,178 |
NSP Americas |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 156,117 | 166,017 | 175,922
Contribution margin: |  |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 64,366 | 69,408 | 75,005
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 3,162 | 3,965 | 8,999
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 8,791 | 7,884 | 3,997
Assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 115,322 |  |  |  | 127,246 |  |  |  | 115,322 | 127,246 |
NSP Americas | General health |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 68,134 | 74,492 | 78,187
NSP Americas | Immunity |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 18,430 | 20,451 | 19,185
NSP Americas | Cardiovascular |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 11,491 | 11,454 | 12,677
NSP Americas | Digestive |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 44,370 | 45,231 | 47,659
NSP Americas | Personal care |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 6,701 | 7,260 | 7,537
NSP Americas | Weight management |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 6,991 | 7,129 | 10,677
NSP Russia, Central and Eastern Europe |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 38,585 | 32,190 | 29,998
Contribution margin: |  |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 13,042 | 10,930 | 10,525
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 16 | 55 | 131
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 70 | 60 | 42
Assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 7,664 |  |  |  | 6,664 |  |  |  | 7,664 | 6,664 |
NSP Russia, Central and Eastern Europe | General health |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 16,088 | 14,813 | 12,907
NSP Russia, Central and Eastern Europe | Immunity |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 4,095 | 3,530 | 3,349
NSP Russia, Central and Eastern Europe | Cardiovascular |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,841 | 2,166 | 2,212
NSP Russia, Central and Eastern Europe | Digestive |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 9,725 | 8,261 | 8,009
NSP Russia, Central and Eastern Europe | Personal care |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 4,711 | 2,330 | 2,370
NSP Russia, Central and Eastern Europe | Weight management |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,125 | 1,090 | 1,151
Synergy WorldWide |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 141,028 | 123,833 | 124,793
Contribution margin: |  |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 43,118 | 35,377 | 38,034
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 1,304 | 763 | 564
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 878 | 621 | 713
Assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | 49,936 |  |  |  | 44,047 |  |  |  | 49,936 | 44,047 |
Synergy WorldWide | General health |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 40,953 | 31,973 | 35,283
Synergy WorldWide | Immunity |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 481 | 508 | 620
Synergy WorldWide | Cardiovascular |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 59,765 | 50,702 | 51,684
Synergy WorldWide | Digestive |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 15,950 | 16,121 | 12,536
Synergy WorldWide | Personal care |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 7,873 | 8,532 | 8,981
Synergy WorldWide | Weight management |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 16,006 | 15,997 | 15,689
NSP China |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 29,080 | 19,989 | 10,446
Contribution margin: |  |  |  |  |  |  |  |  |  |  |
Total contribution margin |  |  |  |  |  |  |  |  | 23,256 | 15,307 | 6,748
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 321 | 603 | 430
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 67 | 69 | 56
Assets: |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 20,094 |  |  |  | $ 17,238 |  |  |  | 20,094 | 17,238 |
NSP China | General health |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,720 | 3,738 | 1,551
NSP China | Immunity |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,594 | 468 | 370
NSP China | Cardiovascular |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 4,860 | 3,886 | 2,617
NSP China | Digestive |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 10,978 | 8,361 | 4,323
NSP China | Personal care |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,981 | 350 | 629
NSP China | Weight management |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 4,947 | $ 3,186 | $ 956

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