Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Outstanding Options, Warrants and Preferred Stock Excluded from Computation of Basic and Diluted Net Loss per Share

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

	2013		2012
Options to purchase common stock		1,796		1,623
Convertible preferred stock (as converted)		8,631		7,567
Convertible preferred stock warrants (as converted)		618		554
Common stock warrant		—		2