Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Basic and diluted loss per share

The following table presents the basic and diluted loss per share (in thousands, except per share amounts):

	For the Years Ended December 31,
	2016			2015			2014
Net loss	$	(66,837	)	$	(85,516	)	$	(64,899	)
Weighted-average shares of common stock outstanding	55,595			54,171			53,267
Net loss per share — basic and diluted	$	(1.20	)	$	(1.58	)	$	(1.22	)

Anti-dilutive shares excluded from calculation of net loss per share

The following table presents the number of anti-dilutive shares excluded from the calculation of diluted net loss per share (in thousands):

	December 31,
	2016	2015	2014
Options to purchase common stock and restricted stock units	10,635	10,860	8,554
Shares issuable pursuant to employee stock purchase plan	89	77	—
Convertible notes	4,682	4,682	4,682
Common stock warrants	4,682	4,682	4,682
Total shares excluded from net loss per share	20,088	20,301	17,918