statements of operations within general and administrative expenses - affiliate. As of December 31, 2017, the Company had not awarded any additional RSUs, and as a result, there was no unrecognized compensation cost in relation to RSUs as of December 31, 2017.
During the years ended December 31, 2017, 2016 and 2015, the Company awarded 523,877, 439,595 and 1,979,098 time-based RSUs, respectively, to certain employees and executive officers of SunEdison, TerraForm Global, Inc. and the Company. The weighted average grant-date fair value of these time-based awards during the same periods was $6.4 million, $5.1 million and $29.4 million, respectively, which was calculated based on the Company's closing stock price on the respective dates of grant. The vesting schedules of the awarded RSUs ranged from six months to four years, and the Company was recognizing the grant-date fair value as compensation cost on a straight-line basis over the vesting period.
The removal of a former Chief Financial Officer of the Company on November 20, 2015 resulted in the forfeiture of 106,250 RSUs as well as the immediate accelerated vesting of an additional 106,250 RSUs. The aforementioned termination resulted in a net increase to the Company's stock-based compensation expense for the year ended December 31, 2015 of $0.9 million.
On July 28, 2015, SunEdison began recognizing expense related to 199,239 performance-based RSUs granted by the Company to certain employees of First Wind in connection with its acquisition by SunEdison on January 29, 2015. The performance-based awards were issued in three tranches covering the 2015, 2016 and 2017 fiscal year performance periods and were based on the achievement of targets related to additions to SunEdison's renewable energy generation project development pipeline and backlog, the volume of renewable energy generation projects transferred into the Company or SunEdison's warehouse vehicles and the achievement of cash available for distribution by wind power plants sold to the Company through the First Wind Acquisition agreement. The grant-date fair value of these awards was $6.2 million which was being recognized as compensation expense on a straight-line basis over the requisite service periods of one year for the 2015 tranche, two years for the 2016 tranche, and three years for the 2017 tranche. The grant-date fair value of these awards was calculated based on the Company's stock price on the date of grant since meeting the requisite performance conditions was considered probable as of that date. As the achievement of these performance metrics was not considered probable as of the first quarter of 2016, all previously recognized compensation expense for the tranches covering 2015 and 2016 was reversed during the first quarter of 2016. These performance-based RSUs were all forfeited prior to the consummation of the Merger.
As of December 31, 2017 and 2016, there were no outstanding stock options and no unrecognized compensation cost in relation to stock options.
17. LOSS PER SHARE
Basic loss per share is computed by dividing net loss attributable to Class A common stockholders by the number of weighted average ordinary shares outstanding during the period. Diluted loss per share is computed by adjusting basic loss per share for the impact of weighted average dilutive common equivalent shares outstanding during the period, unless the impact is anti-dilutive. Common equivalent shares represent the incremental shares issuable for unvested restricted Class A common stock.
Unvested RSAs that contain non-forfeitable rights to dividends are treated as participating securities and are included in the loss per share computation using the two-class method. The two-class method is an earnings allocation formula that treats participating securities as having rights to earnings that would otherwise have been available to common stockholders. This method determines earnings (loss) per share based on dividends declared on common stock and participating securities (i.e. distributed earnings), as well as participation rights of participating securities in any undistributed earnings. Undistributed losses are not allocated to participating securities since they are not contractually obligated to share in the losses of the Company. The numerator for undistributed loss per share is also adjusted by the amount of deemed dividends related to the accretion of redeemable non-controlling interest since the redemption value of the non-controlling interest was considered to be at an amount other than fair value (and was considered a right to an economic distribution that differed from other common stockholders) and as accretion adjustments were recognized in additional paid-in capital and not within net loss attributable to