Cash used in operating activities in the nine months ended September 30, 2024 was primarily due to our net loss for the period of $21.5 million, adjusted by non-cash items of $4.8 million and a decrease of $3.3 million in our net operating assets and liabilities. The non-cash items consist of $17.3 million related to a gain from change in fair value of convertible debt, $7.5 million of non-cash interest expense on the 2023 Loan and the 2024 Loan, $2.5 million related to stock-based compensation expense, $1.5 million related to change in right-of-use asset and $0.9 million related to depreciation and amortization expense. The decrease in our net operating assets and liabilities was primarily due to a decrease of $4.2 million in operating lease liability related to lease payments and payments for the construction of office and laboratory and manufacturing space at our new leased facility in Los Angeles, CA, a decrease of $2.0 million in accounts payable and accrued liabilities, an increase of $0.8 million in accrued compensation, and a decrease of $2.1 million in prepaid expenses and other current assets.
Cash used in operating activities in the nine months ended September 30, 2023 was primarily due to our net loss for the period of $49.2 million, adjusted by non-cash items of $20.1 million and a decrease of $10.2 million in our net operating assets and liabilities. The non-cash items consist of $13.0 million related to a loss from change in fair value of convertible debt, $3.9 million related to a loss on convertible debt extinguishment, $1.2 million of non-cash interest expense on the 2023 Loan, $0.7 million related to stock-based compensation expense, $0.7 million related to depreciation and amortization expense and $0.7 million related to a change in right-of-use assets. The decrease in our net operating assets and liabilities was primarily due to a decrease of $9.7 million in operating lease liability, which primarily relates to payments to the construction of office and laboratory and manufacturing space at our new leased facility in Los Angeles, CA, a decrease of $0.3 million in accounts payable and accrued liabilities, a decrease of $0.1 million in accrued compensation, partially offset by an increase of $0.1 million in prepaid expenses and other current assets.
Cash Flows Used in Investing Activities
Net cash used in investing activities was $2.0 million and $5.7 million for the nine months ended September 30, 2024 and 2023, respectively, which is attributable to purchases of laboratory and manufacturing equipment in connection with the construction of a new office, laboratory and manufacturing space at our leased facility in Los Angeles, CA.
Cash Flows from Financing Activities
Cash provided by financing activities for the nine months ended September 30, 2024 was $34.9 million, which consisted primarily of proceeds from issuance of term debt, net of issuance costs of less than $0.1 million, and proceeds from exercise of stock options of $0.1 million.
Cash provided by financing activities for the nine months ended September 30, 2023 was $54.0 million, which consisted primarily of proceeds from issuance of convertible debt, net of issuance costs of $29.1 million, proceeds from issuance of term debt, net of issuance costs of $24.9 million, and proceeds from exercise of stock options of less than $0.1 million, partially offset by less than $0.1 million of the payments for taxes related to net share settlement of equity awards.
Off-Balance Sheet Arrangements
As of September 30, 2024, we did not have off-balance sheet arrangements.
Critical Accounting Policies and Estimates
Management’s discussion and analysis of financial condition and results of operations are based upon our condensed consolidated financial statements, which have been prepared in accordance with U.S. GAAP. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate estimates and assumptions, including but not limited to those related to convertible debt, stock-based compensation expense, accruals for research and development costs, lease assets and liabilities, the valuation of deferred tax assets, valuation of uncertain income tax positions, impairment of goodwill and intangible assets and impairment of