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Stockholders' Equity (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2019

Dec. 31, 2018

Stockholders Equity Note [Abstract]

Summary of Stock Option Activity

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

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value
Outstanding at December 31, 2018			—
Granted			1,782				196.70
Exercised			—
Cancelled/Forfeited			(142	)			196.70
Outstanding at September 30, 2019			1,640			$	196.70				9.4			$	—
Exercisable at September 30, 2019			1,095			$	196.70				9.4			$	—

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 nine months ended September 30, 2019:

		Nine months ended September 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 September 30,								Nine months ended September 30,
(in thousands)		2019				2018				2019				2018
Selling, general and administrative		$	54			$	116			$	160			$	58
Research and development			16				—				43				(63	)
Total		$	70			$	116			$	203			$	(5	)

Summary of Warrant Activity

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

		Warrants				Exercise Price per Share				Weighted Average Exercise Price				Weighted Average Remaining Life (Years)
Outstanding at December 31, 2018			93,835			$	7.00 - $7,000			$	150.67				5.75
Issued			1,001,995								42.00
Exercised			(11,285	)							7.00
Exchanged			(82,521	)							170.31
Outstanding at September 30, 2019			1,002,024			$	7.00 - $42.00			$	42.00				5.05

The Company issued warrants as part of its offerings in 2013, 2015, 2016 and 2018 as well as part of its issuance of convertible notes in 2016 and 2018 and an exchange agreement in 2017. A summary of warrant activity is as follows:

		Warrants				Exercise Price per Share				Weighted Average Exercise Price				Weighted Average Remaining Life (Years)
Outstanding at January 1, 2017			1			$ $	197,225,000 - 13,798,400,000			$	637,218,564				5.59
Warrants issued			21								1,610,000
Warrants exercised			(1	)							2,954,000
Warrants expired			(1	)							591,675,000
Outstanding at December 31, 2017			20			$ $	857,500 - 13,798,400,000			$	1,098,300				4.88
Warrants issued in Feb 2018 registered direct offering			1,538								6,531
Warrants issued with convertible notes			98,814								126
Exercised			(6,536	)							1,252
Expired			(1	)							13,798,400,000
Outstanding at December 31, 2018			93,835			$	7.00 - $7,000			$	150.67				5.75

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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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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