General and administrative expenses consist primarily of costs incurred for salaries and personnel-related expenses, including bonus and stock-based compensation expense, for our finance, legal and human resource functions, expenses for director and officer insurance, outside contractor and professional service fees, audit and compliance expenses, legal, patent-related costs, accounting and other advisory services, as well as allocated facilities and information technology costs, including depreciation.
General and administrative expenses for the three months ended September 30, 2024 decreased $1.1 million, or 10%, to $9.8 million, compared with $10.9 million for the three months ended September 30, 2023. This decrease was primarily driven by a decrease of $0.8 million of stock-based compensation expense that related to the conclusion of the amortization period for the Earn-Out Restricted Shares by the third quarter of 2023 and decreased headcount, and a $0.3 million decrease in insurance expense due to lower premiums incurred to cover potential liabilities under our indemnification obligations to our directors and certain officers of the Company.
General and administrative expenses for the nine months ended September 30, 2024 decreased $8.1 million, or 22%, to $28.9 million, compared with $36.9 million for the nine months ended September 30, 2023. This decrease was primarily driven by a decrease of $4.0 million of stock-based compensation expense that related to the conclusion of the amortization period for the Earn-Out Restricted Shares by the third quarter of 2023 and lower stock-based compensation expense following an executive officer’s departure in January 2024, a $1.9 million decrease in accounting related expense due to the reduction in audit fees from the prior period resulting from a more efficient reporting process, a $1.4 million decrease in insurance expense due to lower premiums incurred to cover potential liabilities under our indemnification obligations to our directors and certain officers of the Company compared to the prior year period, and a $0.5 million decrease in legal expenses which were higher in 2023 primarily to support our annual compliance as a large accelerated filer.
Non-Operating Items
Interest Income
Interest income primarily consists of interest earned on our cash and cash equivalents and marketable debt securities, which are primarily invested in money market funds and U.S. treasury securities, and accretion income from the U.S. treasury securities.
During the three and nine months ended September 30, 2024, we had interest income of $3.7 million and $11.8 million, respectively, compared with $4.2 million and $12.5 million for the three and nine months ended September 30, 2023, respectively. The $0.5 million and $0.7 million decreases from each of the three and nine months ended September 30, 2023 to each of the three and nine months ended September 30, 2024 were due to lower investment balances primarily arising from cash used in operations.
Change in Fair Value of Earn-Out Liabilities
During the three and nine months ended September 30, 2024, we incurred a gain of $1.0 million and $3.3 million, respectively, associated with the change in fair value of the Sponsor Earn-Out liabilities compared with a gain of $1.9 million and $5.4 million, respectively, for the three and nine months ended September 30, 2023. With the fair value of the Sponsor Earn-Out liabilities tied to the Company’s stock price, continued volatility in the stock price or changes in the expected term could result in further gains or losses resulting from the change in fair value. Refer to “Note 8 – Sponsor Earn-Out Liabilities” to the unaudited interim condensed consolidated financial statements for additional information.
Miscellaneous Income (Expense), Net
During the three months ended September 30, 2024, we had miscellaneous expense of $0.5 million, compared with less than $0.1 million miscellaneous expense for the three months ended September 30, 2023. This $0.5 million increase in miscellaneous expense was due to a decline in the fair value of our investment in publicly traded companies.
During the nine months ended September 30, 2024, we had miscellaneous expense of $0.2 million, compared with miscellaneous income of $0.4 million for the nine months ended September 30, 2023. This $0.6 million decrease was the result of an increase in the loss on foreign currency translation offset by an increase in the fair value of our investment in publicly traded companies.
Provision from Income Taxes
The provision for income taxes for the three and nine months ended September 30, 2024 decreased to $0.1 million and $0.4 million, compared to $0.2 million and $0.7 million for the three and nine months ended September 30, 2023, respectively, primarily due to local taxes in the foreign jurisdictions in which the Company operates.