Basic and Diluted Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2013

Basic and Diluted Net Loss Per Share [Abstract]

Summary of Potential Common Shares

Potential common shares not included in calculating diluted net loss per share are as follows:

	December 31,
	2013	2012
Stock options	19,114,436	12,922,766
Stock warrants	6,426,968	1,397,939
Nonvested Restricted stock units	1,050,000
Total	26,591,404	14,320,705