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Convertible Notes Payable - Schedule of Inputs Used to Value the Series D Warrants (Details) | Sep. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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June 2018 Series D Warrants [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Contractual life |  |  | 5 years |
June 2018 Pre-Funded Series D Warrants [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Contractual life |  |  | 5 years |
Contractual Term [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Contractual life | 5 years |  |  |
Contractual Term [Member] | Minimum [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Contractual life |  | 1 year 1 month 6 days |  | 9 months 25 days
Contractual Term [Member] | Maximum [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Contractual life |  | 5 years 1 month 6 days |  | 4 years 10 months 17 days
Contractual Term [Member] | June 2018 Series D Warrants [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Contractual life |  | 5 years |  |
Contractual Term [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] |  |  |  |
Contractual life |  | 5 years 6 months |  |
Contractual Term [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] |  |  |  |
Contractual life |  | 6 years 6 months |  |
Expected Volatility [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Warrants measurement input | 2.018 |  |  |
Expected Volatility [Member] | Minimum [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Warrants measurement input |  | 1.457 |  | 1.309
Expected Volatility [Member] | Maximum [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Warrants measurement input |  | 2.653 |  | 2.669
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] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |
Warrants measurement input | 0.016 |  |  |
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 |  | 0.025 |  | 0.017
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 |  | 0.026 |  | 0.021
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=117815213&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=117815213&loc=d3e19207-110258 + Details
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