Thank you, Marvin, and to everyone for joining today. Here are some key financial highlights for the third quarter ended September 30, 2021. The Total revenue for the quarter was $1.071 million, an increase of 9% compared to $980,000 during the 3 months ended September 30, 2020. CGuard EPS had revenue of $1.031 million, an increase of 24% from $833,000 for the same period last year.
This sales increase was mainly due to procedures with CGuard EPS, which are generally scheduled for nonemergency cases, began this quarter to return to normal levels in additional territories as compared to the 3 months ended September 30, 2020, when procedures with CGuard EPS were still somewhat postponed as hospitals shifted resources to patients affected by COVID-19. This increase in sales of CGuard EPS was partially offset by a decrease of 73% in sales of MGuard EPS from $147,000 during the 3 months ended September 30, 2020, to $40,000 during the 3 months ended December 30, 2021.
For the 3 months ended September 30, 2021, we had a gross profit of $92,000 compared to $298,000 during the 3 months ended September 30, 2020. This decrease in gross profit resulted from $136,000 increase in material and labor costs, mainly due to an increase in sales volume as well as a short-term increase in production cost per unit, an increase of write-offs of $66,000 due to component supply issues, a $57,000 increase in new employee training costs and an increase of $38,000 in miscellaneous expenses during the 3 months ended September 30, 2021.
This decrease was partially offset by $91,000 increase in revenue, mainly due to the increases in sales volume previously stated. Gross margin decreased to 9% during the 3 months ended September 30, 2021, from 30% during the 3 months ended September 30, 2020, driven by the reasons just stated.
Total operating expenses for the quarter ended September 30, 2021, were $4.123 million, an increase of 65% compared to $2.493 million for the same period in 2020. This increase was primarily due to increases of $700,000 in expenses related to the commencement of the C-Guardians FDA study, $400,000 in salary expenses and related accruals due to additional resources, mainly in our product development and sales infrastructure; $151,000 in development expenses associated with CGuard EPS new delivery system and accessory solutions; $147,000 in share-based compensation related to expenses due to the recognition of grants made from August 31, 2020; $102,000 in sales and marketing expenses associated with expansion of existing and new markets; $81,000 of directors' and officers' liability insurance expense due to increased premiums caused by recent trends in the overall industry; and $41,000 in miscellaneous expense.
Net loss for the third quarter of 2021 totaled $4.071 million or $0.53 per basic and diluted share, compared to a net loss of $2.233 million or $0.96 per basic and diluted share for the same period in 2020. The average amount of shares outstanding used for the earnings per share calculation were 7,739,463 in Q3 2021 and 2,325,619 in Q3 2020, both adjusted to reflect the 1 for 15 reverse split affected by us on April 26, 2021. As of September 30, 2021, cash, cash equivalents and short-term bank deposits were $37.1 million compared to $12.6 million as of December 31, 2020.
With that, I'd like to now turn the call over for questions. Operator, please go ahead.