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REVENUE RECOGNITION - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) product_category segment | Dec. 31, 2018 USD ($) | Jan. 01, 2018 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) | $ 4,693 |  |  |  | $ (2,072) |  |  |  | $ 4,693 | $ (2,072) |
Sales | 91,695 | $ 88,524 | $ 90,724 | $ 91,272 | 97,374 | $ 88,828 | $ 91,266 | $ 87,342 | 362,215 | 364,810 |
Increase in operating income | $ 3,908 | $ 4,701 | $ 4,538 | $ 2,978 | $ (1,229) | $ 3,513 | $ 2,186 | $ 881 | $ 16,125 | 5,351 |
Refund period |  |  |  |  |  |  |  |  | 90 days |  |
Sales returns |  |  |  |  |  |  |  |  | $ 1,900 | 1,700 |
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 |  |
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 |  |  |  |  |  |  |  |  | $ 6,200 | $ 7,100 |

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