Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Net Loss Per Share

Schedule of computation of basic and diluted loss per share applicable to common stockholders

        The following table sets forth the computation of basic and diluted loss per share applicable to common stockholders (in thousands, except per share data):

	Year Ended December 31,
	2014			2013			2012
Net loss applicable to common stockholders	$	(49,520	)	$	(29,044	)	$	(13,510	)
Weighted average number of common shares used in net loss per share applicable to common stockholders—basic and diluted		22,647			16,160			5,810
Net loss per share applicable to common stockholders—basic and diluted	$	(2.19	)	$	(1.80	)	$	(2.33	)

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,
(in thousands)	2014		2013		2012
Outstanding stock options and restricted stock units		3,683		2,509		1,410
Founders' stock		329		987		1,645
Total		4,012		3,496		3,055