Net Loss Attributable to Common Stockholders Per Share of Common Stock (Tables)

9 Months Ended

Sep. 30, 2013

Net Loss Attributable to Common Stockholders Per Share of Common Stock

Schedule of basic and diluted net loss attributable to common stockholders per share

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
	(unaudited)
Numerator:
Net loss	$	(2,243	)	$	(1,675	)	$	(7,675	)	$	(15,582	)
Series F preferred stock deemed dividend	(15,849		)	—			(15,849		)	—
Net loss attributable to common stockholders	$	(18,092	)	$	(1,675	)	$	(23,524	)	$	(15,582	)
Denominator:
Weighted average number of shares of common stock outstanding for basic and diluted net loss attributable to common stockholders per share	49,115,766			7,541,832			21,686,759			7,440,430
Basic and diluted net loss attributable to common stockholders per share	$	(0.37	)	$	(0.22	)	$	(1.08	)	$	(2.09	)

Schedule of securities excluded from the calculation of diluted net loss attributable to common stockholders per share

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2013	2012	2013	2012
	(unaudited)
Warrants to purchase preferred stock	—	140,933	—	140,933
Warrants to purchase common stock	39,824	—	39,824	—
Preferred stock	—	32,563,192	—	32,563,192
Stock option awards	7,170,783	6,800,481	7,170,783	6,800,481
Restricted stock unit awards	70,119	—	70,119	—
Total anti-dilutive securities	7,280,726	39,504,606	7,280,726	39,504,606