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Convertible Notes Payable - Schedule of Inputs Used to Value the Series D Warrants (Details) | Jun. 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 | 4 years 6 months |  |  |
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 17 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 9 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 | 1.636 |  |  |
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 | 0.018 |  |  |
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=99377789&loc=d3e19207-110258 + Details
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