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Note 2 - Fair Value Measurement - Financial Assets and Liabilities on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets | $ 90,403 | $ 7,448
Liabilities | 9,932 | 41,516
Contingent Consideration Liabilities [Member] |  |
Liabilities | 7,152 |
Warrant Liabilities [Member] |  |
Liabilities | 2,780 | 39,602
Money Market Funds [Member] |  |
Assets | 90,403 | 6,448
Convertible Debt Securities [Member] |  |
Assets |  | 1,000
Contingent Consideration Liabilities [Member] |  |
Liabilities |  | 1,914
Fair Value, Inputs, Level 1 [Member] |  |
Assets | 90,403 | 6,448
Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities | 0 |
Fair Value, Inputs, Level 1 [Member] | Warrant Liabilities [Member] |  |
Liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Assets | 90,403 | 6,448
Fair Value, Inputs, Level 1 [Member] | Convertible Debt Securities [Member] |  |
Assets |  | 0
Fair Value, Inputs, Level 1 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities |  | 0
Fair Value, Inputs, Level 2 [Member] |  |
Assets | 0 | 0
Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities | 0 |
Fair Value, Inputs, Level 2 [Member] | Warrant Liabilities [Member] |  |
Liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |
Assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Convertible Debt Securities [Member] |  |
Assets |  | 0
Fair Value, Inputs, Level 2 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities |  | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets | 0 | 1,000
Liabilities | 9,932 | 41,516
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities | 7,152 |
Fair Value, Inputs, Level 3 [Member] | Warrant Liabilities [Member] |  |
Liabilities | 2,780 | 39,602
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |
Assets | $ 0 | 0
Fair Value, Inputs, Level 3 [Member] | Convertible Debt Securities [Member] |  |
Assets |  | 1,000
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities |  | $ 1,914

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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