Table:
|  | 2019 | 2018 | 2017 |
| --- | --- | --- | --- |
| Cost of revenue | $207 | $78 | $52 |
| Selling and marketing | 2,967 | 2,656 | 1,577 |
| Research and development | 2,013 | 1,801 | 1,028 |
| General and administrative | 4,450 | 4,415 | 2,821 |
| Stock-based compensation expense included in expenses | $9,637 | $8,950 | $5,478 |
Paragraphs:
Stock-based Compensation
The following table summarizes stock-based compensation expense related to RSUs, stock options, and ESPP shares for the fiscal years ended September 30, 2019, 2018, and 2017, which were allocated as follows (amounts shown in thousands):
Question:
What is the percentage change in the cost of revenue between 2017 and 2019?
Answer: (207-52)/52  = 298.08