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Stockholders' Equity - Common Stock are Reserved for Future Issuance (Details) - shares shares in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Equity [Abstract] |  |
Warrants outstanding (in shares) | 17,698 | 963
Stock options outstanding (in shares) | 395 | 10
Options reserved for future issuance under the Company's 2017 Incentive Plan (in shares) | 421 |
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) | 18,642 |

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- Definition Common Stock Capital Shares Reserved For Future Issuance Of Employee Stock Purchase Plan + References No definition available. + Details
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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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- 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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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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