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Note 12 - Quarterly Financial Information (Unaudited) | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Quarterly Financial Information [Text Block] | Note 12 — Quarterly Financial Information (Unaudited)
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
20 20 Quarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 4,823 |  |  | $ | 2,871 |  |  | $ | 6,102 |  |  | $ | 4,016 |
Net Loss |  |  | (37,599 | ) |  |  | (38,607 | ) |  |  | (46,115 | ) |  |  | (60,493 | )
Basic and diluted net loss per share |  |  | (0.24 | ) |  |  | (0.24 | ) |  |  | (0.26 | ) |  |  | (0.34 | )
2019 Quarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 5,887 |  |  | $ | 1,448 |  |  | $ | 1,775 |  |  | $ | 39,725 |
Net Loss |  |  | (31,054 | ) |  |  | (37,629 | ) |  |  | (37,592 | ) |  |  | (2,622 | )
Basic and diluted net loss per share |  |  | (0.28 | ) |  |  | (0.34 | ) |  |  | (0.34 | ) |  |  | (0.02 | )

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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