Table:
|  | Year Ended | Year Ended |
| --- | --- | --- |
| Stock-Based Compensation by Type of Award | December 31, 2019 | December 31, 2018 |
| Stock options | $2,756 | $2,926 |
| RSUs | 955 | 1,129 |
| Total stock-based compensation expense | $3,711 | $4,055 |
Paragraphs:
Stock-based compensation expense is included in general and administrative expense for each period as follows:
As of December 31, 2019, there was $4,801 of unrecognized stock-based compensation expense related to unvested employee stock options and $1,882 of unrecognized stock-based compensation expense related to unvested RSUs. These costs are expected to be recognized over a weighted-average period of 2.13 and 2.33 years, respectively.
Question:
What was the percentage change in the amount of RSUs in 2019 from 2018?