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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders Equity Note [Abstract]

Stock option activity

Stock option activity for 2017, 2016 and 2015 is as follows:

		Stock Option Activity under the Plans
		Stock Options				Exercise Price per Share				Weighted Average Exercise Price				Weighted Average Remaining Life (Years)
Outstanding at December 31, 2014			51			$6,944 - $1,372,672				$	132,328.00				8.83
Granted			94				6,664				6,664.00
Forfeited			(9	)		6,664-949,760					168,056.00
Outstanding at December 31, 2015			136			$6,664-$1,372,672				$	42,840.00				8.95
Granted			—				—				—
Forfeited			(48	)		6,664-190,848					8,382.50
Outstanding at December 31, 2016			88			$6,644-$1,326,080				$	12,815.73				7.90
Granted			42			$	84.00			$	84.00
Forfeited			(3	)		$	6,664.00			$	6,664.00
Outstanding at December 31, 2017			127			$84.00-$381,696.00				$	8,750.55				7.79
Exercisable at December 31, 2017			75			$6,664.00 - $381,696.00				$	13,882.03				7.10

Assumptions used to determine estimated fair value of stock options granted

The estimated fair value of each option award granted was determined on the date of grant using an option pricing model with the following assumptions for option grants made in 2017 and 2015. There were no option grants during 2016.

		Year ended December 31,				Year ended December 31,
		2017				2015
Weighted average risk-free interest rates			2.15	%			1.82	%
Weighted average expected volatility			170.42	%			97.70	%
Dividend yield			—				—
Weighted average expected option term (in years)			7.29				5.15
Weighted average grant date fair value		$	82.34			$	4,964.73

Summary of non-vested options

A summary of the Company’s non-vested options to purchase shares as of December 31, 2017 and changes during the years ended December 31, 2017 and December 31, 2016 are presented below: 

		Non-Vested Options
		Number of Options				Weighted Average Exercise Price
Non-vested at December 31, 2015			101			$	7,892.50
Granted			—				—
Vested			(45	)			9,397.50
Forfeited			(114	)			6,730.50
Non-vested at December 31, 2016			25			$	6,686.40
Granted			42				84
Vested			(13	)			6,707.08
Forfeited			(2	)			6,664.00
Non-vested at December 31, 2017			52			$	1,349.38

Summary of restricted stock activity

A summary of the Company’s restricted stock activity as of December 31, 2017 and changes during the years ended December 31, 2017 and December 31, 2016 are presented below: 

		Restricted Stock Activity
		Number of Shares				Weighted Average Grant Date Fair Value
Non-vested at December 31, 2015			103			$	6,664.00
Granted			13				1,512.00
Vested			(55	)			5,404.00
Forfeited			(15	)			6,664.00
Non-vested at December 31, 2016			46			$	6,664.00
Granted			261				84.00
Vested			(24	)			6,664.00
Forfeited			—				—
Non-vested at December 31, 2017			283			$	595.52

Summary of warrant activity

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, 2014			152			$9,800-$39,424		$	30,341.76				2.78
Issued			3,120						4,480.00
Exercised			(39	)					4,592.00
Expired			(8	)					4,592.00
Outstanding at December 31, 2015			3,224			$4,144-$39,424		$	5,607.33				2.16
Issued			20,091						1,680.00
Exercised			(1,428	)					963.00
Expired			(1,271	)					1,988.00
Outstanding at December 31, 2016			20,616			$563.50-$39,424		$	1,820.00				5.59
Issued			7,127,551						4.60
Exercised			(122,848	)					8.44
Expired			(19,367	)					1,690.50
Outstanding at December 31, 2017			7,005,952			$2.45-$39,424		$	3.14				4.88

X

- Definition

Tabular disclosure of the changes in outstanding nonvested shares.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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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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