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License rights and other intangible assets, net (Details Narrative) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) patents | Mar. 31, 2020 USD ($) | Dec. 31, 2020 patents
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of issued patents | patents | 79 |  | 77
Domestic US Patents |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of issued patents | patents | 40 |  | 38
Licensing Agreements [Member] | Cost of Sales [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ | $ 756 | $ 746 |
Patents [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangible assets | $ | $ 70 | $ 63 |

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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=121586364&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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