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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Stockholders Equity Note [Abstract]

Summary of Stock Option Activity

The following is a summary of stock option activity under the Plan for the six months ended June 30, 2019:  

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2018			—
Granted			1,250,000				0.28
Exercised			—
Cancelled/Forfeited			(83,333	)			0.28
Outstanding at June 30, 2019			1,166,667			$	0.28			8.8		$	—
Exercisable at June 30, 2019			399,998			$	0.28			9.2		$	—

Summary of Weighted Average Assumptions Used to Compute Fair Value

The following weighted average assumptions were used to compute the fair value of stock options granted during the six months ended June 30, 2019:

		Six months ended June 30, 2019
Dividend yield		N/A
Expected volatility			147.6	%
Weighted average risk-free interest rate			2.6	%
Weighted average expected life (in years)			5.5
Weighted average grant date fair value		$	0.259

Summary of Recognized Share-based Compensation Cost

		Three months ended June 30,								Six months ended June 30,
(in thousands)		2019				2018				2019				2018
Selling, general and administrative		$	58			$	(71	)		$	106			$	(58	)
Research and development			17				(69	)			27				(63	)
Total		$	75			$	(140	)		$	133			$	(121	)

Summary of Warrant Activity

The following is a summary of warrant activity for the six months ended June 30, 2019:

		Warrants				Exercise Price per Share		Weighted Average Exercise Price				Weighted Average Remaining Life (Years)
Outstanding at December 31, 2018			65,685,269			$0.01 - $10.00		$	0.22				5.75
Exercised			(7,898,853	)					0.01
Exchanged			(64,000	)
Outstanding at June 30, 2019			57,722,416			$0.01 - $10.00		$	0.23				5.24

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- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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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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