Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Schedule of Common Stock Shares Issued

During the year ended December 31, 2015, we issued shares of common stock as follows:

	Common Stock
	Shares		Amount
Shares issued for vested restricted stock units		56,500	$	—
Shares issued for Employee Stock Purchase Plan options		130,421		110,066
		186,921	$	110,066

During the year ended December 31, 2014, we issued shares of common stock as follows:

	Common Stock
	Shares		Amount
Sale of common stock and warrants, net of issuance costs		10,192,500	$	18,577,018
Note and accrued interest conversions		5,573,831		11,130,261
Common stock issued for services		20,408		50,000
		15,786,739	$	29,757,279

Summary Of Warrant Activity

The following table summarizes the warrants issued and outstanding as of December 31, 2015:

Warrants Issued and Outstanding as of December 31, 2015
	Date of		Exercise		Shares of
Description	Issuance	Expiration	Price		Common Stock
Exercisable warrants
Warrants	04/18/2014	04/01/2017	$	2.00		1,441,000
Warrant	05/07/2014	05/07/2017	$	2.65		200,000
Warrant	05/28/2014	10/31/2016	$	4.31		450,000
Warrants	09/24/2014	09/24/2019	$	2.50		9,000,000
Warrants	10/20/2014	10/20/2019	$	2.50		700,000
Total exercisable warrants						11,791,000
Contingent warrants
Warrants	05/28/2014	10/31/2018	$	4.31		1,200,000
Less warrants cancelled						(1,200,000	)
Total contingent warrants						—
Total warrants issued and outstanding						11,791,000

Summary of Stock Option Activity

Stock Options

The following table summarizes the stock option activity from January 1, 2014 through December 31, 2015:

	Stock Options
					Weighted-
				Exercise	Average
	Number			Price Per	Exercise Price
	of Shares			Share	Per Share
Outstanding at January 1, 2014		4,141,948		$2.00 — $3.25	$	2.48
Granted		1,305,000		$1.45 — $3.75	$	2.77
Canceled/Forfeited		(440,416	)	$2.05 — $2.10	$	2.09
Outstanding at December 31, 2014		5,006,532		$1.45 — $3.75	$	2.66
Granted		2,242,625		$0.78 — $1.46	$	0.83
Canceled/Forfeited		(1,305,249	)	$1.28 — $3.75	$	2.52
Outstanding at December 31, 2015		5,943,908		$0.78 — $3.75	$	2.04

Summary of Stock Option Outstanding

The following additional information applies to options outstanding at December 31, 2015:

Ranges of Exercise Prices	Outstanding at December 31, 2015		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price		Exercisable at December 31, 2015		Weighted- Average Exercise Price
$0.78 - $3.75		5,943,908		6.8	$	2.04		3,643,718	$	2.44

The following additional information applies to options outstanding at December 31, 2014:

Ranges of Exercise Prices	Outstanding at December 31, 2014		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price		Exercisable at December 31, 2014		Weighted- Average Exercise Price
$1.45 - $3.75		5,006,532		6.5	$	2.66		3,301,532	$	2.58

Schedule of Weighted-Average Estimated Value of Employee Stock Options Granted

The weighted-average estimated value of employee stock options granted during the years ended December 31, 2015 and 2014 were estimated using the Black-Scholes-Merton option pricing model with the following weighted-average assumptions:

	Years Ended December 31,
	2015			2014
Expected volatility		94	%		94	%
Risk-free interest rate		1.45	%		0.92	%
Expected dividends		0.00	%		0.00	%
Expected term in years		4.3			3.4