NET INCOME (LOSS) PER SHARE

Basic net income (loss) per common share is computed by dividing the net income (loss) relevant to the common stockholders by the weighted-average number of shares outstanding during the year. Diluted net income (loss) per common share uses the same net income (loss) divided by the sum of the weighted-average number of shares of common stock outstanding during the period, plus dilutive effects of options, performance and restricted stocks units outstanding during the period calculated using the treasury method and the potential dilutive effects of preferred stocks (if any) calculated using the if-converted method. The table below shows the calculations for years ended December 31, 2017, 2016 and 2015.



(In thousands, except for per share data)	2017		2016			2015
Numerator (both basic and diluted)
Net income (loss) relevant to common stockholders	$	12,613	$	(53,147	)	$	(45,853	)
Denominator
Denominator for basic income (loss) per share	76,371		44,787			34,993
Dilutive effect of stock options	2,903		—			—
Dilutive effect of performance stock units	59		—			—
Dilutive effect of non-vested restricted stock units	250		—			—
Denominator for diluted income (loss) per share	79,583		44,787			34,993
Basic net income (loss) per common share	$	0.17	$	(1.19	)	$	(1.31	)
Diluted net income (loss) per common share	$	0.16	$	(1.19	)	$	(1.31	)

As shown in the table below, the following non-vested restricted stock units, preferred stock, performance stock units, and stock options have not been included in the calculation of diluted income (loss) per share for years ended December 31, 2017, 2016 and 2015 as they would be anti-dilutive to the calculation above.



(Count in thousands)	2017	2016	2015
Stock options	—	4,646	3,486
Preferred stock	—	17,000	—
Performance stock units	—	—	—
Non-vested restricted stock units	—	372	372
	—	22,018	3,858