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Stockholders' Equity (Common Stock are Reserved for Future Issuance) (Details) - shares shares in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Equity [Abstract] |  |
Warrants outstanding (in shares) | 19,224 | 963
Stock options outstanding (in shares) | 434 | 10
Options reserved for future issuance under the Company's 2017 Incentive Plan (in shares) | 381 |
Shares reserved for future issuance under the Employee Stock Purchase Plan (in shares) | 115 |
Restricted stock units (in shares) | 13 |
Total reserved for future issuance (in shares) | 20,167 |

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- Definition Options reserved for future issuance under the Company's 2007 Incentive Plan. + References No definition available. + Details
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