Table:
|  |  | Year Ended |  |
| --- | --- | --- | --- |
|  | June 30,<br>2019 | June 30,<br>2018 | June 30,<br>2017 |
| Cost of product revenue | $844 | $564 | $333 |
| Cost of service revenue | 1,639 | 1,131 | 589 |
| Research and development | 10,443 | 7,642 | 3,312 |
| Sales and marketing | 11,747 | 9,843 | 4,253 |
| General and administrative | 8,224 | 8,453 | 4,146 |
| Total share-based compensation expense | $32,897 | $27,633 | $12,633 |
Paragraphs:
Share Based Compensation Expense
Share-based compensation expense recognized in the financial statements by line item caption is as follows (in thousands):
The amount of share-based compensation expense capitalized in inventory has been immaterial for each of the periods presented.
Question:
What was the change in cost of product revenue between 2018 and 2019?
Answer: 844-564 = 280