Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Summary of Significant Accounting Policies [Abstract]

Company's potential common stock

For the nine months ended September 30, 2012 and 2011, the Company’s potential common stock includes the following shares, all of which have been excluded from the computation of diluted net loss per share because their impact is antidilutive:

	Nine Months Ended September 30,
	2012		2011
Convertible preferred stock		—		24,332,186
Options to purchase common stock		5,396,959		4,172,318
Warrants to purchase common stock		309,500		159,500
		5,706,459		28,664,004