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Warrants to Acquire Shares of Common Stock (Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model) (Details) - $ / shares shares in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Class of Warrant or Right [Line Items] |  |
Warrants outstanding (in shares) | 19,224 | 963
Series A Convertible Preferred |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding (in shares) | 1,384 | 0
Strike price (in usd per share) | $ 2.10 |
Expected term (years) | 5 years 4 days |
Volatility % | 83.18% |
Risk-free rate % | 2.94% |
Galena February 2017 |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding (in shares) | 32 | 567
Strike price (in usd per share) | $ 33 | $ 13
Expected term (years) | 3 years 4 months 17 days | 4 years 1 month 13 days
Volatility % | 85.39% | 79.29%
Risk-free rate % | 2.25% | 2.09%
Galena Other |  |
Class of Warrant or Right [Line Items] |  |
Warrants outstanding (in shares) | 74 | 80
Strike price (in usd per share) | $ 888.22 | $ 28.4
Expected term (years) | 2 years 8 months 5 days | 3 years 2 months 9 days
Volatility % | 85.96% | 74.05%
Risk-free rate % | 2.32% | 2.09%

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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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