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Stockholders' Equity (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Stockholders Equity Note [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 |
Summary of Change in Level 3 Warrant Liability Value | The following table summarizes the change in our Level 3 warrant liability value (in thousands):
Warrant liability |  | March 31, 2019 |  |  | December 31, 2018 |
Beginning balance |  | $ | 916 |  |  | $ | 3,149 |
Change in fair value |  |  | (210 | ) |  |  | (2,233 | )
Ending balance |  | $ | 706 |  |  | $ | 916 |
| The following table summarizes the change in our Level 3 warrant liability value (in thousands):
|  | Years ended December 31, |
Warrant liability |  | 2018 |  |  | 2017 |
Beginning balance |  | $ | 3,149 |  |  | $ | — |
Change in fair value |  |  | (2,233 | ) |  |  | — |
Ending balance |  | $ | 916 |  |  | $ | — |

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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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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + 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 (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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