As of September 30, 2018, $6.5 million of total unrecognized compensation expense related to stock options is expected to be recognized over a weighted average period of 1.9 years.
As of September 30, 2018, the Company had 82,500 shares related to outstanding performance-based stock options with a grant date fair value of $0.4 million that will vest based on the achievement of corporate goals set by the Compensation Committee of the Company’s Board of Directors. Of this amount, options related to 41,250 shares were deemed probable of achievement as of September 30, 2018 and therefore, the related expense is being recognized over the service period. During the three and nine months ended September 30, 2018, the Company recognized stock-based compensation expense of $56,000 and $0.2 million, respectively, related to these stock options. As of September 30, 2018, there was $0.3 million unrecognized compensation costs related to these outstanding performance-based stock options.
RSU activity for the nine months ended September 30, 2018, is summarized below:
As of September 30, 2018, $3,000 of unrecognized compensation expense related to employee RSUs is expected to be recognized over a weighted average period of 1.1 years.
The following table shows total stock-based compensation expense for stock options, RSUs and ESPP in the condensed consolidated statements of operations and comprehensive (loss) income (in thousands):