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Note 7 - Acquired Intangible Assets, Net (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020 | Nov. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amortization of Intangible Assets, Total |  |  |  | $ 7,400 | $ 1,000 | $ 1,000
Impairment of Intangible Assets, Finite-lived |  |  |  | 2,439 | 389 | $ 0
In Process Research and Development [Member] |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  | $ 0 |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  | 1,414 | (0) |
Developed Technology Rights [Member] |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  | 1,025 | 389 |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  | 400 |
Selling, General and Administrative Expenses [Member] | Developed Technology Rights [Member] |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  | $ 1,000 | $ 300 |
Parcus Medical and Arthrosurface [Member] |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 90,600 |  |  |  |
Parcus Medical and Arthrosurface [Member] | Research and Development Expense [Member] |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 1,400 |  |  |  |  |

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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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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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