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v3.20.4

Note 4 - Fair Value Measurements (Details Textual) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 15, 2020 USD ($) | Feb. 03, 2020 USD ($) | Jan. 24, 2020 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Payment for Contingent Consideration Liability, Financing Activities | $ 5,000 |  |  |  |  |  |  | $ 4,478 | $ (0) | $ (0)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  | $ (12,500) | $ 4,100 | $ 4,200 | $ (24,500) | (28,666) | 0 | $ 0
COVID 19 [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  |  |  |  | (28,700) |  |
Parcus Medical and Arthrosurface Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  |  |  |  |  |  |  | $ 100,000 |  |
Parcus Medical and Arthrosurface Acquisitions [Member] | Measurement Input, Discount Rate [Member] | Regulatory Earn Out Milestone [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  | 0.020 |  |  |  | 0.020 |  |
Parcus Medical and Arthrosurface Acquisitions [Member] | Measurement Input, Discount Rate [Member] | Regulatory Earn Out Milestone [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  | 0.025 |  |  |  | 0.025 |  |
Arthrosurface [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  | $ 40,000 |  |  |  |  |  |  |  |
Arthrosurface [Member] | Probability of Achievement [Member] | Regulatory Earn Out Milestone [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  | 0.60 |  | 0.60 |  |  |  | 0.60 |  |
Arthrosurface [Member] | Probability of Achievement [Member] | Regulatory Earn Out Milestone [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  | 0.90 |  | 0.75 |  |  |  | 0.75 |  |
Arthrosurface [Member] | Measurement Input, Weighted Average Cost of Capital [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  | 0.115 |  | 0.114 |  |  |  | 0.114 |  |
Parcus Medical [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  |  | $ 60,000 |  |  |  |  |  |  |
Parcus Medical [Member] | Measurement Input, Weighted Average Cost of Capital [Member] |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  | 0.145 | 0.114 |  |  |  | 0.114 |  |
US Treasury Bill Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Total |  |  |  | $ 2,500 |  |  |  | $ 2,500 | $ 27,500 |

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