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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2014

The following common stock warrants were outstanding at June 30, 2014:


NUMBER OF SHARES	EXERCISE PRICE PER SHARE		EXPIRATION DATE
298,404	$	0.33	July 18, 2018
301,987		0.33	January 16, 2019
17,042		0.33	December 9, 2015
15,250		0.33	January 30, 2019
1,544		25.92	October 13, 2016

Weighted-Average Fair Value of the Options Granted

The weighted-average fair value of the options granted during the six months ended June 30, 2014 was $6.72 per share, applying the Black-Scholes-Merton option pricing model utilizing the following weighted-average assumptions:


	Six Months Ended June 30, 2014
Expected term (years)		6.25
Expected volatility		90.50	%
Risk-free interest rate		2.14	%
Expected dividend yield		0	%

Stock-Based Compensation Expense

Stock-based compensation expense was classified on the statement of operations as follows for the three and six months ended June 30, 2014 and 2013:


	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Research and development	$	127,658	$	49,560	$	219,124	$	98,310
General and administrative		290,771		60,103		491,519		119,364

Total stock-based compensation expense	$	418,429	$	109,663	$	710,643	$	217,674

2003 Stock Incentive Plan [Member]

Company's Stock Option Activity

A summary of the Company’s stock option activity under the 2003 Plan for the six months ended June 30, 2014 is as follows:


	OUTSTANDING OPTIONS			WEIGHTED- AVERAGE EXERCISE PRICE		WEIGHTED- AVERAGE REMAINING CONTRACTUAL TERM (YEARS)		AGGREGATE INTRINSIC VALUE (IN THOUSANDS)
Outstanding as of December 31, 2013		972,860		$	1.18		7.19	$	7,000
Options granted		—
Options exercised		(110,486	)		1.16
Options forfeited		(633	)		1.12

Outstanding as of June 30, 2014		861,741			1.26		5.70		6,180

Vested or expected to vest as of June 30, 2014		859,829			1.26		5.70		6,168

Exercisable as of June 30, 2014		802,034			1.20		5.56		5,799

2013 Equity Incentive Plan [Member]

Company's Stock Option Activity

A summary of the Company’s stock option activity under the 2013 Plan for the six months ended June 30, 2014 is as follows:


	OUTSTANDING OPTIONS		WEIGHTED- AVERAGE EXERCISE PRICE		WEIGHTED- AVERAGE REMAINING CONTRACTUAL TERM (YEARS)		AGGREGATE INTRINSIC VALUE (IN THOUSANDS)
Outstanding as of December 31, 2013		—	$	—		—	$	—
Options granted		919,188		8.90
Options exercised		—
Options forfeited		—

Outstanding as of June 30, 2014		919,188		8.90		9.58		372

Vested or expected to vest as of June 30, 2014		893,964		8.90		9.31		362

Exercisable as of June 30, 2014		—		—		—		—

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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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.

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