Description of Business and Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2019

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,
	2019			2018
Numerator:
Loss from continuing operations, net of income taxes	$	(17,620	)	$	(10,514	)
Income from discontinued operations, net of income taxes	—			1,309
Net loss	$	(17,620	)	$	(9,205	)
Denominator:
Weighted-average common shares outstanding - basic and diluted	46,220			37,522
Net income (loss) per share - basic and diluted:
Continuing operations	$	(0.38	)	$	(0.28	)
Discontinued operations	—			0.03
Net loss per share - basic and diluted	$	(0.38	)	$	(0.25	)

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,
	2019	2018
Outstanding options to purchase common stock	331	328
Unvested restricted stock awards	—	14
Unvested restricted stock unit awards	2,431	3,261
Employee stock purchase plan awards	103	41
Bonus and director fees to be paid in stock awards	146	109
Convertible senior notes	7,245	7,245
	10,256	10,998