Basic and Diluted Net Income (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

(A) For the three and nine months ended September 30, 2017 and 2016, the following equity awards, by type, were excluded from the calculation, as their effect would have been anti-dilutive (in thousands):

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2017	2016	2017	2016
Stock options	3,527	3,951	3,527	3,951
Restricted stock units	639	130	639	130
Performance-based restricted stock units (B)	999	851	999	851
Total equity award shares excluded	5,165	4,932	5,165	4,932

(B) Performance-based restricted stock units are presented based on attainment of 100% of the performance goals being met.

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

A reconciliation of the numerator and the denominator used to calculate basic and diluted net loss per share is as follows (in thousands, except per share amounts):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2017			2016			2017			2016
Numerator
Net loss	$	(15,411	)	$	(2,638	)	$	(32,973	)	$	(6,194	)
Denominator — Basic
Weighted average shares used to calculate net loss per share, basic	39,087			38,056			38,922			37,402
Denominator — Diluted
Weighted average shares used to calculate net loss per share, basic	39,087			38,056			38,922			37,402
Effect of dilutive restricted stock units (A)	—			—			—			—
Effect of dilutive stock options (A)	—			—			—			—
Weighted average shares used to calculate net loss per share, diluted	39,087			38,056			38,922			37,402
Net loss per share
Basic	$	(0.39	)	$	(0.07	)	$	(0.85	)	$	(0.17	)
Diluted	$	(0.39	)	$	(0.07	)	$	(0.85	)	$	(0.17	)