Table:
|  | 2019 | 2018 | 2017 |
| --- | --- | --- | --- |
| Statements of Operations: |  |  |  |
| Revenue | $10,310 | $12,629 | $12,149 |
| Cost of revenue | 4,405 | 6,295 | 6,627 |
| Gross profit | 5,905 | 6,334 | 5,522 |
| Operating expenses: |  |  |  |
| Research and development | 12,350 | 9,948 | 9,572 |
| Selling, general and administrative | 8,918 | 9,982 | 9,900 |
| Loss from operations | (15,363) | (13,596) | (13,950) |
| Interest expense | (350) | (108) | (115) |
| Interest income and other expense, net | 189 | 77 | 21 |
| Loss before income taxes | (15,524) | (13,627) | (14,044) |
| (Benefit from) Provision for income taxes | (80) | 152 | 87 |
| Net loss | $(15,444) | $(13,779) | $(14,131) |
| Net loss per share: (1) |  |  |  |
| Basic and diluted | $(2.02) | $(2.16) | $(2.56) |
| Weighted average shares: |  |  |  |
| Basic and diluted | 7,663 | 6,365 | 5,521 |
Paragraphs:
Note: Net loss equals to comprehensive loss for all years presented.
(1) Net loss per share and weighted average shares, basic and diluted are adjusted to reflect 1-for-14 reverse stock split effected on December 23, 2019.
The accompanying notes form an integral part of these Consolidated Financial Statements.
CONSOLIDATED STATEMENTS OF OPERATIONS (in thousands, except per share amounts)
Question:
What is the percentage change in cost of revenue between 2018 and 2019?
Answer: (4405 - 6295)/6295  = -30.02