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Warrants to Acquire Shares of Common Stock (Schedule of Warrant Activity) (Details) shares in Thousands | 9 Months Ended
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Sep. 30, 2018 shares
Class of Warrant or Right, Outstanding [Roll Forward] |
Warrants outstanding , Beginning balance (in shares) | 963
Granted (in shares) | 21,327
Exercised (in shares) | (2,525)
Canceled/Expired (in shares) | (541)
Warrants outstanding , Ending balance (in shares) | 19,224
July 2018 Offering |
Class of Warrant or Right, Outstanding [Roll Forward] |
Warrants outstanding , Beginning balance (in shares) | 0
Granted (in shares) | 15,268
Exercised (in shares) | 0
Canceled/Expired (in shares) | 0
Warrants outstanding , Ending balance (in shares) | 15,268
Pre-funded 2018 Offering |
Class of Warrant or Right, Outstanding [Roll Forward] |
Warrants outstanding , Beginning balance (in shares) | 0
Granted (in shares) | 4,675
Exercised (in shares) | (2,525)
Canceled/Expired (in shares) | 0
Warrants outstanding , Ending balance (in shares) | 2,150
Series A Convertible Preferred |
Class of Warrant or Right, Outstanding [Roll Forward] |
Warrants outstanding , Beginning balance (in shares) | 0
Granted (in shares) | 1,384
Exercised (in shares) | 0
Warrants outstanding , Ending balance (in shares) | 1,384
2017 Equilibria |
Class of Warrant or Right, Outstanding [Roll Forward] |
Warrants outstanding , Beginning balance (in shares) | 316
Granted (in shares) | 0
Exercised (in shares) | 0
Warrants outstanding , Ending balance (in shares) | 316
Galena February 2017 |
Class of Warrant or Right, Outstanding [Roll Forward] |
Warrants outstanding , Beginning balance (in shares) | 567
Granted (in shares) | 0
Exercised (in shares) | 0
Canceled/Expired (in shares) | (535)
Warrants outstanding , Ending balance (in shares) | 32
Galena Other |
Class of Warrant or Right, Outstanding [Roll Forward] |
Warrants outstanding , Beginning balance (in shares) | 80
Granted (in shares) | 0
Exercised (in shares) | 0
Canceled/Expired (in shares) | (6)
Warrants outstanding , Ending balance (in shares) | 74

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- Definition Number of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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