Net Income (Loss) Per Common Share

Basic and diluted net income (loss) per common share are computed by dividing consolidated net income (loss) by the basic and diluted weighted-average number of common shares outstanding, respectively, for the period. Basic net income (loss) per common share was $(0.13) and $0.08 for the three months ended June 30, 2017 and 2016, respectively, and $(0.10) and $0.00 for the six months ended June 30, 2017 and 2016, respectively. Diluted net income (loss) per common share was $(0.13) and $0.08 for the three months ended June 30, 2017 and 2016, respectively, and $(0.10) and $0.00 for the six months ended June 30, 2017 and 2016, respectively.

The following table shows the calculation of the diluted weighted-average number of common shares outstanding:



	Three Months Ended June 30,		Six Months Ended June 30,
	2017	2016	2017	2016
Weighted-average number of common shares outstanding — basic	60,273,980	58,710,321	59,893,356	58,662,100
Total dilutive effect of outstanding share-based payments	—	933,629	—	975,752
Weighted-average number of common shares outstanding — diluted	60,273,980	59,643,950	59,893,356	59,637,852

The following potentially dilutive share-based payments were not included in the diluted net income (loss) per common share calculations as the impact would have been antidilutive for the periods presented:



	Three Months Ended June 30,		Six Months Ended June 30,
	2017	2016	2017	2016
Stock options	5,238,465	7,376,383	5,633,489	7,358,351
Restricted stock units	1,484,597	2,315,818	1,877,066	2,274,574
Performance awards of restricted stock units	2,781,424	3,614,784	2,758,462	3,631,937
Shares to be purchased under employee stock purchase plan	12,562	12,537	6,316	6,303

The PRSUs outstanding under the 2016 LTIP as of June 30, 2017 were not included in the computation of diluted net income (loss) per common share as the number of shares that will ultimately be issued is contingent upon the Company’s achievement of certain predetermined performance conditions and does not meet the criteria for inclusion per the applicable U.S. GAAP guidance.