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Note 3 - Fair Value Measurement - Financial Assets and Liabilities on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Liabilities | $ 0 |
Liabilities | 0 |
Fair Value, Recurring [Member] |  |
Assets | 7,448 |
Assets | 7,448 |
Liabilities | 41,516 |
Liabilities | 41,516 |
Fair Value, Recurring [Member] | Warrant Liabilities [Member] |  |
Liabilities | 39,602 | $ 28,516
Liabilities | 39,602 | 28,516
Fair Value, Recurring [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities | 1,914 |
Liabilities | 1,914 |
Fair Value, Recurring [Member] | Money Market Funds [Member] |  |
Assets | 6,448 | 30,657
Assets | 6,448 | 30,657
Fair Value, Recurring [Member] | Convertible Debt Securities [Member] |  |
Assets | 1,000 |
Assets | 1,000 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets | 6,448 |
Assets | 6,448 |
Liabilities |  |
Liabilities |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Warrant Liabilities [Member] |  |
Liabilities |  |
Liabilities |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities |  |
Liabilities |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Assets | 6,448 | 30,657
Assets | 6,448 | 30,657
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Convertible Debt Securities [Member] |  |
Assets |  |
Assets |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Assets |  |
Liabilities |  |
Liabilities |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Warrant Liabilities [Member] |  |
Liabilities |  |
Liabilities |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities |  |
Liabilities |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |
Assets |  |
Assets |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Convertible Debt Securities [Member] |  |
Assets |  |
Assets |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets | 1,000 |
Assets | 1,000 |
Liabilities | 41,516 |
Liabilities | 41,516 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Warrant Liabilities [Member] |  |
Liabilities | 39,602 | 28,516
Liabilities | 39,602 | 28,516
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Consideration Liabilities [Member] |  |
Liabilities | 1,914 |
Liabilities | 1,914 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |
Assets |  |
Assets |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Convertible Debt Securities [Member] |  |
Assets | 1,000 |
Assets | $ 1,000 |

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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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