Net Income (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

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

The following table sets forth the computation of basic and diluted net loss per share of common stock attributable to common stockholders:

	Year Ended
	December 31,
	2017			2016			2015
	(in thousands, expect per-share data)
Net loss	$	(3,248	)	$	(87,182	)	$	(82,907	)
Weighted average common shares outstanding — Basic	49,343			48,592			42,269
Plus incremental shares from assumed conversions:
Dilutive effect of stock options, warrants, unvested awards	—			—			—
Weighted average common shares outstanding — Diluted	49,343			48,592			42,269
Net loss per share :
Basic	$	(0.07	)	$	(1.79	)	$	(1.96	)
Diluted	$	(0.07	)	$	(1.79	)	$	(1.96	)

Schedule of antidilutive securities excluded from computation of diluted net income per share of common stock

The weighted average shares listed below were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive for the periods presented or were otherwise excluded under the treasury stock method. The treasury stock method calculates dilution assuming the exercise of all in-the-money options and vesting of restricted stock, reduced by the repurchase of shares with the proceeds from the assumed exercises, unrecognized compensation expense for outstanding awards and the estimated tax benefit of the assumed exercises.

	Year Ended
	December 31,
	2017	2016	2015
	(in thousands)
Stock options	6,356	6,411	6,260
Warrants	3,061	3,071	954
Unvested restricted stock awards	144	120	54
Total	9,561	9,602	7,268