Description of Business and Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2018			2017
Numerator
Net loss	$	(9,205	)	$	(10,399	)
Denominator
Weighted-average common shares outstanding	37,522			32,197
Net loss per share
Basic and diluted	$	(0.25	)	$	(0.32	)

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 Months Ended March 31,
	2018	2017
Outstanding options to purchase common stock	328	352
Unvested restricted stock awards	14	58
Unvested restricted stock unit awards	3,261	2,356
Employee stock purchase plan awards	41	57
Bonus and director fees to be paid in stock awards	109	102
Convertible senior notes	7,245	—
	10,998	2,925