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Summary of Significant Accounting Policies | 3 Months Ended
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Mar. 31, 2024
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies—The Company’s significant accounting policies are disclosed in the audited consolidated financial statements and the notes thereto in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023 filed with the SEC on March 21, 2024. Since the date of those consolidated financial statements, there have been no material changes to the Company’s significant accounting policies. Restricted Cash
(in thousands) | As of March 31, 2024 |  | As of December 31, 2023
Letter of credit security: Waltham lease | $ | — |  |  | $ | 250 |
Letter of credit security: Vienna Austria lease | 206 |  |  | 211 |
Letter of credit security: Boston lease | 571 |  |  | 571 |
Total restricted cash | $ | 777 |  |  | $ | 1,032 |
Restricted cash included in prepaid expenses and other current assets | $ | — |  |  | $ | 250 |
Restricted cash included in other assets | $ | 777 |  |  | $ | 782 |
In connection with the Company’s lease agreements for its facilities in Massachusetts and Austria, the Company maintains letters of credit, which are secured by restricted cash, for the benefit of the respective landlord. The Company’s Waltham lease agreement expired in December 2023; however, the letter of credit was in place as of December 31, 2023 pending the landlord’s completion of its lease expiration procedures. The letter of credit was released in first quarter ended March 31, 2024. In accordance with the Company’s Hercules Loan Agreement and as further described in Note 7, the Company at all times must maintain a minimum level of cash of $20.0 million in an account or accounts in which Hercules has a first priority security interest as further described in Note 7. The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets to the sum to the total of amounts shown in the Company’s consolidated statements of cash flows as of March 31, 2024 and December 31, 2023:
(in thousands) | March 31, 2024 |  | December 31, 2023 |  |  |  |
Cash and cash equivalents | $ | 60,493 |  |  | $ | 99,216 |  |  |  |  |
Restricted cash, current (included within prepaid expenses and other current assets) | — |  |  | 250 |  |  |  |  |
Restricted cash, non-current | 777 |  |  | 782 |  |  |  |  |
Total cash, cash equivalents and restricted cash | $ | 61,270 |  |  | $ | 100,248 |  |  |  |  |
Goodwill— There were no triggering events during the three months ended March 31, 2024 that necessitated an interim impairment test of goodwill. Recently Adopted Accounting Standards In November 2023, the Financial Accounting Standards Board (“FASB”) issued ASU 2023-07, Segment Reporting (Topic 326) Improvements to Reportable Segment Disclosures (“ASU 2023-07”). Among other disclosure enhancements, ASU 2023-07 requires that entities with one reportable segment, such as the Company, disclose general information for its reportable segment, such as the title and position of the individual identified as the Chief Operating Decision Maker (“CODM”), which for the Company is the Chief Executive Officer, the types of products and services provided by the reportable segment, the measure of profit or loss reviewed by the CODM to evaluate performance of the reportable segment and other financial results such as interest income, interest expense and depreciation associated with the reportable segment. The amendments in ASU 2023-07 will become effective for the Company in its consolidated financial statements as of and for the three years ending December 31, 2024 and must be adopted retrospectively. Although the Company continues to evaluate the potential impact of ASU 2023-07, the Company does not believe that the adoption of ASU 2023-07 will have a material impact on its consolidated financial statement when adopted. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740) Improvements to Income Tax Disclosures (“ASU 2023-09”). The amendments in ASU 2023-09 require that entities on an annual basis disclose specific categories in the income tax rate reconciliation and provide additional information for reconciling items if the effect of those reconciling items that exceed a certain threshold. ASU 2023-09 will also require more disaggregated disclosures related to income taxes paid. The amendments in ASU 2023-09 will become effective for the Company in its December 31, 2024 consolidated financial statements. Although the Company continues to evaluate the impact of ASU 2023-09, the Company expects that these amendments will require further disclosures in the tax footnote of its annual consolidated financial statements and will not have a material impact on its consolidated financial states when adopted.

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