Description of Business and Basis of Presentation (Tables)

6 Months Ended

Jun. 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 June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Numerator
Net loss	$	(11,302	)	$	(10,118	)	$	(20,507	)	$	(20,517	)
Denominator
Weighted-average common shares outstanding	38,068			35,526			37,797			33,871
Net loss per share
Basic and diluted	$	(0.30	)	$	(0.28	)	$	(0.54	)	$	(0.61	)

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 Six Months Ended June 30,
	2018	2017
Outstanding options to purchase common stock	357	393
Unvested restricted stock awards	—	30
Unvested restricted stock unit awards	3,294	2,499
Employee stock purchase plan awards	50	—
Bonus and director fees to be paid in stock awards	302	226
Convertible senior notes	7,245	—
	11,248	3,148