Net loss per share (Tables)

12 Months Ended

Dec. 31, 2012

Net loss per share

Schedule of reconciliation of net loss to net loss applicable to common stockholders

The following table reconciles net loss to net loss applicable to common stockholders (in thousands, except per share data):

	Year Ended December 31, 2012			Period from April 5, 2011 (inception) to December 31, 2011			Period from April 5, 2011 (inception) to December 31, 2012
Net loss applicable to common stockholders	$	(13,510	)	$	(2,725	)	$	(16,235	)
Weighted average number of common shares used in net loss per share applicable to common stockholders—basic and diluted		5,810			909			3,734
Net loss per share applicable to common stockholders—basic and diluted	$	(2.33	)	$	(3.00	)	$	(4.35	)

Schedule of amounts excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect

The amounts in the table below were excluded from the calculation of diluted net loss per share, prior to the use of the treasury stock method, due to their anti-dilutive effect (in thousands):

	Year Ended December 31, 2012		Period from April 5, 2011 (inception) to December 31, 2011		Period from April 5, 2011 (inception) to December 31, 2012
Series A Preferred Stock		—		3,065		—
Series B Preferred Stock		—		—		—
Outstanding stock options and restricted stock units		1,410		618		1,410
Founders' stock		1,645		2,319		1,645