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REVENUE RECOGNITION - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment product_category | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2018 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) | $ (2,072) |  |  |  | $ (2,072) |  |  |  | $ (2,072) | $ (2,072) |  |
Sales | 97,374 | $ 88,828 | $ 91,266 | $ 87,342 | 88,286 | $ 89,301 | $ 81,344 | $ 83,098 | 364,810 | 342,029 | $ 341,159 |
Increase in operating income | $ (1,229) | $ 3,513 | $ 2,186 | $ 881 | $ (2,841) | $ 2,154 | $ 23 | $ 2,051 | $ 5,351 | 1,387 | 10,039 |
Refund period |  |  |  |  |  |  |  |  | 90 days |  |  |
Sales returns |  |  |  |  |  |  |  |  | $ 1,700 | 1,600 | 1,400 |
Number of principal categories of products | product_category |  |  |  |  |  |  |  |  | 6 |  |  |
Number of business segments | segment |  |  |  |  |  |  |  |  | 4 |  |  |
NSP Americas; NSP Russia, Central and Eastern Europe; and NSP China |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 3 |  |  |
Synergy WorldWide |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 141,028 | 123,833 | 124,793 |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 |  |  |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  |  |  |  |  |  |  |  | $ 900
Sales |  |  |  |  |  |  |  |  | $ 200 |  |  |
Increase in operating income |  |  |  |  |  |  |  |  | 47 |  |  |
Shipping and Handling |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 7,100 | $ 8,200 | $ 9,200 |

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