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Stockholders' Equity (Common Stock are Reserved for Future Issuance) (Details) - shares shares in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Equity [Abstract] |  |
Warrants outstanding | 19,557 | 2,570
Stock options outstanding | 505 | 561
Options reserved for future issuance under the Company's 2007 Incentive Plan | 466 |
Shares reserved for future issuance under the Employee Stock Purchase Plan | 17 |
Total reserved for future issuance | 20,545 |

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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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