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Revenue Recognition - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment product_category | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Retained earnings (accumulated deficit) | $ 844 |  | $ 844 |  | $ (2,072)
Decrease in revenue | (88,828) | $ (89,301) | (267,436) | $ (253,743) |
Decrease in operating income | (3,513) | (2,154) | $ (6,580) | (4,228) |
Refund period |  |  | 90 days |  |
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] |  |  |  |  |
Decrease in revenue | $ (34,497) | $ (34,470) | $ (103,034) | $ (92,146) |
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
Decrease in revenue |  |  | $ 500 |  |
Decrease in operating income |  |  | $ 200 |  |

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