Net Loss Per Share

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Net Loss Per Share

3. Net Loss Per Share

Net loss attributable to common stockholders per share is computed by dividing the net loss allocable to common stockholders by the weighted average number of shares of common stock outstanding. Outstanding stock options, warrants and preferred stock have not been included in the calculation of the diluted net loss attributable to common stockholders per share because to do so would be anti-dilutive. Accordingly, the numerator and the denominator used in computing both basic and diluted net loss per share for each period are the same.

The following outstanding options, warrants and preferred stock were excluded from the computation of basic and diluted net loss per share for the nine month periods presented because their effect would have been anti-dilutive (in thousands):

	2013		2012
Options to purchase common stock		1,874		1,605
Convertible preferred stock (as converted)		—		7,567
Convertible preferred stock warrants (as converted)		—		554
Common stock warrant		618		2