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(Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Intangible assets |  |  |
Net amount | $ 709 | $ 976 |
Amortization expense for intangible assets | 200 | 100 | $ 100
Estimated Amortization Expense |  |  |
2018 | 186 |  |
2019 | 186 |  |
2020 | 186 |  |
2021 | 134 |  |
2022 | 17 |  |
Total | 709 |  |
Product formulations |  |  |
Intangible assets |  |  |
Gross carrying amount | 1,800 | 1,900 |
Accumulated amortization | 1,100 | 900 |
Net amount | $ 700 | 1,000 |
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 Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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