Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2015

Equity [Abstract]

Assumptions in Computing Option Fair Value

The fair value of all options granted during the three months ended March 31, 2015 was determined using the following assumptions:

Expected volatility	70% - 90%
Risk free interest rate	0.80% - 1.75%
Expected term (years)	3.0 - 5.0
Dividend yield	0%

Summary of Activity Related to Options Granted

Stock option activity is as follows:

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Fair Value
Outstanding December 31, 2013		4,045,324		$	1.85	2.05 Years	$	7,483,849
Granted		252,000		$	3.80
Exercised		(1,138,331	)	$	0.78
Forfeited		(14,000	)	$	2.43
Expired		—			—
Outstanding December 31, 2014		3,144,993		$	2.39	1.48 Years	$	7,516,533
Granted		—			—
Exercised		(218,010	)	$	1.50
Forfeited		—			—
Expired		—			—
Outstanding March 31, 2015		2,926,983		$	2.45	.89 Years	$	7,171,108
Exercisable at March 31, 2015		2,611,319		$	2.36		$	6,162,713
Unvested at March 31, 2015		315,664