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Note 11 - Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Quarterly Financial Information [Table Text Block] |
|  | First |  | Second |  | Third |  | Fourth
2017 Quarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 9,437 |  |  | $ | 3,099 |  |  | $ | 8,760 |  |  | $ | 3,890 |
Net Loss |  |  | (14,219 | ) |  |  | (16,886 | ) |  |  | (15,134 | ) |  |  | (19,543 | )
Basic and diluted net loss per share |  |  | (0.19 | ) |  |  | (0.21 | ) |  |  | (0.18 | ) |  |  | (0.20 | )
2016 Quarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 4,820 |  |  | $ | 4,787 |  |  | $ | 7,763 |  |  | $ | 8,983 |
Net Loss |  |  | (22,832 | ) |  |  | (16,281 | ) |  |  | (11,528 | ) |  |  | (4,503 | )
Basic and diluted net loss per share |  |  | (0.31 | ) |  |  | (0.22 | ) |  |  | (0.16 | ) |  |  | (0.06 | )

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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