v3.19.3

Note 8 - Warrants (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Issuance Date		Expiration Date		Exercise Price		Number of Shares (in thousands)
November, 2015		November, 2025		0.2276		198
January, 2016		January, 2026		0.2276		132
Total						330

Warrants For Series A Convertible Preferred Stock [Member]

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

		As of December 31,
		2017		2018
Risk-free interest rate		2.28	%	2.56% – 2.59	%
Remaining contractual life (in years)		7.92 – 8.08		6.92 – 7.08
Dividend yield		—		—
Expected volatility		71.00	%	76.84	%

X

- Definition

Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis.

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Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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