Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Fair Value of Each Option Award Granted

The fair value of each option award granted is estimated on the date of grant using the Black-Scholes option valuation model and assumptions as noted in the following table:

	June 30,
	2014		2013
Expected life		6.5 years		5.5-6.5 years
Expected volatility		75.51-73.87%		71.71%-76.83%
Risk-free interest rate		2.14-2.45%		.71-1.95%
Dividend yield		—		—