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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Summary of Warrant Activity

The following is a summary of warrant activity for the year ended December 31, 2019 and 2018:

		Number of Shares				Weighted Average
		Underlying Warrants				Exercise Price
Outstanding — December 31, 2017			1,751,708			$	6.46
Issued			—
Exercised			(1,735,419	)		$	5.50
Forfeited/Cancelled (1)			(6,095	)		$	5.50
Outstanding — December 31, 2018			10,194			$	155.73
Issued			—
Exercised			—
Forfeited/Cancelled			(2,337	)		$	499.50
Outstanding — December 31, 2019			7,857			$	53.61

(1)  In November 2018, 1,845 warrants were cancelled by Healthcare Ventures VIII, a related party.

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- References

No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 50
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