Sales, Marketing and Customer Support Expenses
Sales, marketing and customer support expenses increased by $7.6 million, or 39%, from $19.5 million in the three months ended September 30, 2021 to $27.1 million in the three months ended September 30, 2022. The increase was primarily due to an increase in personnel costs, including sales commissions, of $3.5 million to support sales efforts, grow market presence in international markets, drive continued expansion with existing customers, and support existing and new customers, $2.9 million of higher stock-based compensation expense, $0.2 million of higher advertising, promotional, events and other marketing activities, and $0.4 million of higher personnel travel and entertainment expenses to support marketing and sales activities. Sales, marketing and customer support expenses increased by $23.9 million, or 44%, from $54.7 million in the nine months ended September 30, 2021 to $78.5 million in the nine months ended September 30, 2022. The increase was primarily due to an increase in personnel costs, including sales commissions, of $11.5 million to support sales efforts, grow market presence in international markets, drive continued expansion with existing customers, and support existing and new customers, $7.0 million of higher stock-based compensation expense, $1.1 million of higher advertising, promotional, events and other marketing activities, and $1.7 million of higher personnel travel and entertainment expenses to support marketing and sales activities.
General and Administrative Expenses
General and administrative expenses increased by $4.9 million, or 34%, from $14.5 million in the three months ended September 30, 2021 to $19.4 million in the three months ended September 30, 2022. The increase was primarily due to an increase in compensation expenses of $0.4 million, an increase in stock-based compensation expenses of $0.8 million, and a $3.0 million increase in bad debt reserves. As previously disclosed, the three months ended September 30, 2021 period included a reversal of bad debt expense of $1.4 million.
General and administrative expenses increased by $2.3 million, or 4%, from $58.3 million in the nine months ended September 30, 2021 to $60.6 million in the nine months ended September 30, 2022. The increase was primarily due to a $21.7 million reduction in third party costs related to the Company’s IPO and other securities offerings, offset by an increase in compensation expenses of $4.5 million, an increase in stock-based compensation expenses of $3.5 million, an increase in insurance costs of $2.1 million for coverage as a public company, a $2.8 million increase of other costs related to the departures of the Company’s former Chief Operating Officer and Chief Customer Officer, to the impairment of subleased office space and to the disposal of furniture for unoccupied lease office space, an increase in professional fees of $1.8 million, an increase in rent expenses of $1.2 million, and a $4.8 million increase in bad debt reserves. As previously disclosed, the nine months ended September 30, 2021 period included a reversal of bad debt expense of $1.2 million.
Depreciation and Amortization
Depreciation and amortization increased by $0.6 million, or 8%, from $7.5 million in the three months ended September 30, 2021 to $8.1 million in the three months ended September 30, 2022. The increase was primarily due to an increase in intangibles related to the acquisition of OpenSlate, which was partially offset by write-offs and fully depreciated fixed assets. Depreciation and amortization increased by $3.5 million, or 16%, from $22.0 million in the nine months ended September 30, 2021 to $25.4 million in the nine months ended September 30, 2022. The increase was primarily due to an increase in intangibles related to the acquisition of OpenSlate, which was partially offset by write-offs and fully depreciated fixed assets.
Interest Expense
Interest expense is mainly related to the New Revolving Credit Facility, which carries a variable interest rate. Interest expense decreased by less than $0.1 million, from $0.3 million in the three months ended September 30, 2021 to $0.2 million in the three months ended September 30, 2022. Interest expense decreased by $0.3 million, from $0.9 million in the nine months ended September 30, 2021 to $0.7 million in the nine months ended September 30, 2022. The decrease was attributable to a reduction in outstanding debt.