Comparison of the Three and Six Months Ended June 30, 2021 and 2020
Revenue
Revenue for the three months ended June 30, 2021 was $1,581,000, an increase of $1,233,000, or 354%, compared to the revenue for three months ended June 30, 2020 of $348,000. The increase was primarily due to increased volumes of both modules and speaker bundles.
Revenue for the six months ended June 30, 2021 was $2,734,000, an increase of $1,975,000, or 260%, compared to the revenue for the six months ended June 30, 2020 of $759,000. The increase was primarily due to increased volumes of both modules and speaker bundles.
Cost of Revenue and Operating Expenses
Cost of Revenue
Cost of revenue for the three months ended June 30, 2021 was $1,122,000, an increase of $786,000, or 234%, compared to the cost of revenue for the three months ended June 30, 2020 of $336,000. The increase was primarily attributable to the direct material costs associated with higher sales volume.
Cost of revenue for the six months ended June 30, 2021 was $1,980,000, an increase of $1,296,000, or 189%, compared to the cost of revenue for the six months ended June 30, 2020 of $684,000. The increase was primarily attributable to the direct material costs associated with higher sales volume.
Research and Development
Research and development expenses for the three months ended June 30, 2020 were $1,305,000, an increase of $401,000, compared to the research and development expenses for the three months ended June 30, 2020 of $904,000. The increase in research and development expenses is primarily related to increased salary and benefit expense of $306,000, increased stock-based compensation expenses and consultant expenses of $73,000 and $65,000, respectively, partially offset by reduced facility allocation expense of $45,000.
Research and development expenses for the six months ended June 30, 2021 were $2,478,000, an increase of $440,000 compared to the research and development expenses for the six months ended June 30, 2020 of $2,038,000. The increase in research and development expenses is primarily related to increased salary and benefit expense of $403,000 and increased stock-based compensation expenses of $124,000, partially offset by reduced facility allocation expense of $127,000.
Sales and Marketing
Sales and marketing expenses for the three months ended June 30, 2021 were $975,000, an increase of $465,000, compared to the sales and marketing expenses for the three months ended June 30, 2020 of $510,000. The increase in sales and marketing expenses is primarily related increased salary, incentive compensation and benefit expenses of $144,000, increased stock-based compensation, website development and advertising expenses of $32,000, $89,000 and $164,000, respectively.
Sales and marketing expenses for the six months ended June 30, 2021 were $1,849,000, an increase of $641,000, compared to the sales and marketing expenses for the six months ended June 30, 2020 of $1,208,000. The increase in sales and marketing expenses is primarily related increased salary, incentive compensation and benefit expenses of $147,000, increased stock-based compensation, website development and advertising expenses of $56,000, $183,000 and $283,000, respectively.