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INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intangible assets |  |  |
Intangible assets, net | $ 618 | $ 709 |
Amortization expense for intangible assets | 100 | 200 | $ 100
Estimated Amortization Expense |  |  |
2019 | 224 |  |
2020 | 224 |  |
2021 | 153 |  |
2022 | 17 |  |
2023 | 0 |  |
Total | 618 |  |
Product formulations |  |  |
Intangible assets |  |  |
Gross carrying amount | 1,900 | 1,800 |
Accumulated amortization | 1,300 | 1,100 |
Intangible assets, net | $ 600 | 700 |
Product formulations | Minimum |  |  |
Intangible assets |  |  |
Estimated useful lives | 9 years |  |
Product formulations | Maximum |  |  |
Intangible assets |  |  |
Estimated useful lives | 15 years |  |
Blue Hat Product Registrations |  |  |
Intangible assets |  |  |
Gross carrying amount |  |  | $ 500
Impairment of Intangible Assets, Finite-lived |  | $ 100 |
Blue Hat Product Registrations | Minimum |  |  |
Intangible assets |  |  |
Estimated useful lives |  |  | 3 years
Blue Hat Product Registrations | Maximum |  |  |
Intangible assets |  |  |
Estimated useful lives |  |  | 5 years

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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