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Investments
 9 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Marketable Securities
Unrestricted available-for-sale marketable securities held by the Company are as follows (dollars in thousands):
September 30,
2022		December 31,
2021
(unaudited)
Corporate and U.S. government agency and municipal debt securities
Amortized cost$417,576 $253,301 
Gross unrealized gains— 2,349 
Gross unrealized losses(5,342)(238)
Total fair value$412,234 $255,412 
The contractual maturities of the unrestricted available-for-sale marketable securities held by the Company are as follows, (dollars in thousands):
September 30,
2022
(unaudited)
Less than 1 year$280,297 
1 year to 2 years104,346 
2 years to 3 years27,591 
3 years to 4 years— 
Greater than 4 years— 
Total$412,234 
As of September 30, 2022, there was no impairment due to credit loss on any available-for-sale marketable securities.
Investment in Navitor
Development Agreement
In April 2020, the Company entered into a development agreement (the Development Agreement) with Navitor Pharmaceuticals, Inc. (Navitor Inc.). The Company can terminate the Development Agreement upon 30 days' notice. Under the terms of the Development Agreement, the Company and Navitor Inc. will jointly conduct a Phase II clinical program for NV-5138 (SPN-820) for treatment-resistant depression. The Company will bear all of the Phase I and Phase II development costs incurred by either party, up to a maximum of $50 million. In addition, the Company will incur certain other research and development support costs. There are certain additional payment amounts which could be incurred by the Company. These costs are contingent upon Navitor Inc. achieving defined development milestones. The Company has an option to acquire or license NV-5138 (SPN-820), for which additional payments would be required.
Equity investment
In addition to entering into the Development Agreement in April 2020, the Company acquired Series D Preferred Shares of Navitor Inc. for $15 million, representing an approximately 13% ownership position in Navitor Inc.
In March 2021, Navitor Inc. underwent a legal restructuring. In the restructuring, Navitor Inc. became a wholly owned subsidiary of a newly formed limited liability company, Navitor Pharmaceuticals LLC (Navitor LLC), and the outstanding shares of stock in Navitor Inc. were exchanged for units of membership in Navitor LLC having equivalent rights and preferences (Navitor Restructuring). As part of the Navitor Restructuring, the Series D Preferred Shares previously held by the Company were exchanged for Series D Preferred Units in Navitor LLC. In addition, certain assets that did not relate to NV-5138 (SPN-820) were transferred from Navitor Inc. to a newly formed entity that became a separate, wholly owned subsidiary of Navitor LLC.
The Company had determined that Navitor LLC is a VIE. The Company does not consolidate this VIE because the Company lacks the power to direct the activities that most significantly impact Navitor’s economic performance.
Prior to the Navitor Restructuring, the investment was accounted for under the practical expedient allowed for equity securities without readily determinable fair value, which is cost minus impairment plus any changes in observable price changes from an orderly transaction of similar investments in Navitor Inc. Following the legal restructuring and exchange of the preferred shares for member equity units of Navitor LLC, the investment was accounted for under the equity method of accounting due to the Company's ability to exert significant influence over but not control the financial and operating decisions of Navitor LLC. As a result of the change from a cost method investment to an equity method investment, the Company was required to measure its investment initially in accordance with the guidance in ASC 805. The majority of the assets and liabilities recorded in Navitor LLC's financial statements represent working capital items and cash that are being used for research and development purposes and are significantly lower than the Company's investment in Navitor LLC, which created a significant basis difference for the Company's investment in the underlying net assets. The Company determined that substantially all of the fair value of the investment was attributable to a single in-process research and development (IPR&D) asset. As a result, Navitor LLC was not considered a business as defined in ASC 805. In the first quarter of 2021, the $15 million investment, which was previously recorded in Other assets in the condensed consolidated balance sheets, was expensed and recorded in Research and development expense in the condensed consolidated statements of earnings.
The Company records its share of the results of Navitor LLC, a private company, on a quarter lag as the financial information of Navitor LLC is not available on a sufficiently timely basis for the Company to apply the equity method of accounting. In December 2021, Navitor LLC sold one of its subsidiaries and distributed cash to its members in accordance with each member's share of the proceeds from the sale. The Company received $12.9 million in December 2021 from Navitor LLC in connection with this sale. As the Company's policy is to record its share of the results in its equity method investment on a quarter lag as previously indicated, the Company recorded the cash amount received in Other current liabilities in the consolidated balance sheets as of December 31, 2021. In the first quarter of 2022, the Company determined its estimated share of Navitor LLC's year-end 2021 earnings and recorded a gain of $12.9 million in Interest and other income, net in the condensed consolidated statement of earnings.
The maximum exposure to losses related to Navitor LLC is approximately $50 million for Phase I and Phase II development of NV-5138 (SPN-820), and the cost of other development and formulation activities provided by the Company.
Subsequent to the Development Agreement entered into in 2020, no additional equity investment has been made or financing has been provided to Navitor LLC.