The following table sets forth performance share units, restricted stock units, stock options and warrants that were excluded from the calculation of diluted net loss per share as they were anti-dilutive (in thousands):

 

The dilutive impact related to common shares from stock incentive plans and outstanding warrants is determined by applying the treasury stock method of determining value to the assumed vesting of outstanding performance share units and restricted stock units and the exercise of outstanding options and warrants. The dilutive impact related to common shares from contingently issuable performance share units is determined by applying a two-step approach using both the contingently issuable share guidance and the treasury stock method.