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Revenue Recognition - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment product_category | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Retained earnings (accumulated deficit) | $ (653) |  | $ (653) |  | $ (2,072)
Decrease in revenue | (91,266) | $ (81,344) | (178,608) | $ (164,442) |
Decrease in operating income | (2,186) | (23) | $ (3,067) | (2,074) |
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 | $ (36,719) | $ (30,363) | $ (68,537) | $ (57,676) |
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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