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Note 13 - Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2022 |
|  | (in thousands) |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury bills |  | $ | — |  |  | $ | 19,939 |  |  | $ | — |  |  | $ | 19,939 |
Certificate of deposits |  |  | — |  |  |  | 1,756 |  |  |  | — |  |  |  | 1,756 |
Short term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury bills |  |  | — |  |  |  | 179,743 |  |  |  | — |  |  |  | 179,743 |
Certificate of deposits |  |  | — |  |  |  | 1,548 |  |  |  | — |  |  |  | 1,548 |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposits |  |  | — |  |  |  | 186 |  |  |  | — |  |  |  | 186 |
Total |  | $ | — |  |  | $ | 203,172 |  |  | $ | — |  |  | $ | 203,172 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out shares liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out shares (1) |  | $ | — |  |  | $ | — |  |  | $ | 7,136 |  |  | $ | 7,136 |
I-Access contingent consideration (2) |  |  | — |  |  |  | — |  |  |  | 5,665 |  |  |  | 5,665 |
Other non-current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liabilities (1) |  |  | — |  |  |  | 362 |  |  |  | — |  |  |  | 362 |
Total |  | $ | — |  |  | $ | 362 |  |  | $ | 12,801 |  |  | $ | 13,163 |
|  | Year Ended December 31, |
|  | 2021 |
|  | (in thousands) |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury bills |  | $ | — |  |  | $ | 199,999 |  |  | $ | — |  |  | $ | 199,999 |
Certificate of deposits |  |  | — |  |  |  | 1,433 |  |  |  | — |  |  |  | 1,433 |
Short term investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposits |  |  | — |  |  |  | 2,411 |  |  |  | — |  |  |  | 2,411 |
Other assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposits |  |  | — |  |  |  | 285 |  |  |  | — |  |  |  | 285 |
Total |  | $ | — |  |  | $ | 204,128 |  |  | $ | — |  |  | $ | 204,128 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out shares liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out shares (1) |  | $ | — |  |  | $ | — |  |  | $ | 10,012 |  |  | $ | 10,012 |
Other non-current liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liabilities (1) |  |  | — |  |  |  | 458 |  |  |  | — |  |  |  | 458 |
Total |  | $ | — |  |  | $ | 458 |  |  | $ | 10,012 |  |  | $ | 10,470 |

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