Description of Business and Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of computation of basic and diluted net income (loss) per share

The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share data):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Numerator
Net loss	$	(9,723	)	$	(13,860	)	$	(30,230	)	$	(34,377	)
Denominator
Weighted-average common shares outstanding	42,497			37,008			39,381			34,929
Net loss per share
Basic and diluted	$	(0.23	)	$	(0.37	)	$	(0.77	)	$	(0.98	)

Schedule of anti-dilutive shares excluded from computation of net income (loss) per share

The following table summarizes instruments that may be convertible into common shares that are not included in the denominator used in the diluted net loss per share calculation because to do so would be anti-dilutive (in thousands):

	Three and Nine Months Ended September 30,
	2018	2017
Outstanding options to purchase common stock	357	364
Unvested restricted stock awards	—	29
Unvested restricted stock unit awards	3,016	2,760
Employee stock purchase plan awards	77	29
Bonus and director fees to be paid in stock awards	504	349
Convertible senior notes	7,245	6,300
	11,199	9,831