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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			$	—

X

- 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

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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

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