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Secured Convertible Notes and Related Common Stock Purchase Warrants - Schedule of Inputs Used to Value the Series D Warrants (Details) | Sep. 30, 2018 | Dec. 31, 2017
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Expected Life [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Expected life (in years) | 29 days | 9 months 25 days
Expected Life [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Expected life (in years) | 5 years 4 months 9 days | 4 years 10 months 17 days
Expected Life [Member] | June 2018 Series D Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Expected life (in years) | 5 years |
Expected Life [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Expected life (in years) | 5 years 6 months |
Expected Life [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Expected life (in years) | 6 years 6 months |
Expected Volatility [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 1.3947 | 1.3088
Expected Volatility [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 2.5834 | 2.6692
Expected Volatility [Member] | June 2018 Series D Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 1.9410 |
Expected Volatility [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 2.150 |
Expected Volatility [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 3.890 |
Risk-free Interest Rates [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 0.0212 | 0.0168
Risk-free Interest Rates [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 0.0297 | 0.0206
Risk-free Interest Rates [Member] | June 2018 Series D Warrants [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 0.0278 |
Risk-free Interest Rates [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 0.0213 |
Risk-free Interest Rates [Member] | June 2018 Pre-Funded Series D Warrants [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants measurement input | 0.0230 |

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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