Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Options Granted under Company's Stock Incentive Plans, Valuation Assumptions and Fair Values

Options granted under the Company’s stock incentive plans were valued utilizing the Black-Scholes model using the following assumptions and had the following fair values:

	Three Months Ended
	March 31,
	2014	2013
Average risk-free interest rate	0.80%	0.58%
Expected dividend yield	None	None
Expected life	3.5 years	3.5 years
Expected volatility	64.2% to 65.6%	61.5% to 68.9%
Weighted average exercise price	$11.95	$5.15
Weighted average fair value	$5.54	$2.28

Unrecognized Compensation Cost Related to Unexercisable Options and Unvested Restricted Stock and the Weighted Average Remaining Period

As of March 31, 2014 unrecognized compensation cost related to unexercisable options and unvested restricted stock and the weighted average remaining period is as follows:

Remaining expense	$	1,321,865
Weighted average term		1.0 years

Aggregate Intrinsic Value

The Company’s aggregate intrinsic value for stock options and restricted stock outstanding is as follows:

	Three Months Ended March 31,
Aggregate intrinsic value	2014		2013
Stock options	$	6,492,797	$	1,962,883
Restricted stock		1,442,553		1,099,048