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Summary of Significant Accounting Policies (Tables) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |
Schedule of Estimated Fair Value Determined Using Option Pricing Model Assumptions | The warrants are not traded in an active securities market, and as such the estimated the fair value as of March 31, 2019 was determined by using an option pricing model with the following assumptions:
|  | As of March 31, 2019 |  |  | As of December31, 2018 |
Expected term |  | 1.8 years |  |  | 2.1 years |
Common stock market price |  | $ | 13.00 |  |  | $ | 14.50 |
Risk-free interest rate |  |  | 2.38 | % |  |  | 2.48 | %
Expected volatility |  |  | 128 | % |  |  | 125 | %
Resulting fair value (per warrant) |  | $ | 5.00 |  |  | $ | 6.50 |
| The warrants are not traded in an active securities market, and as such the estimated the fair value as of December 31, 2018 was determined by using an option pricing model with the following assumptions:
|  | As of December 31, 2018 |  |  | As of July 25, 2018 (inception date) |
Common stock market price |  | $ | 14.50 |  |  | $ | 36.00 |
Risk-free interest rate |  |  | 2.48 | % |  |  | 2.70 | %
Expected volatility |  |  | 125 | % |  |  | 112 | %
Resulting fair value (per warrant) |  | $ | 6.50 |  |  | $ | 22.50 |
Expected term |  |  | 2.1 years |  |  |  | 2.5 years |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique used to measure similar asset in prior period by class of asset or liability on non-recurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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