Nature of Business and Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). These unaudited condensed consolidated financial statements include all adjustments, which include normal recurring adjustments, necessary for the fair presentation of the Company’s financial position. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements as of and for the year ended December 31, 2022, and the notes thereto, which are included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates and changes in these estimates are recorded when known. The unaudited condensed consolidated financial statements include the accounts of the Company and our wholly owned subsidiary, Aptevo Research and Development LLC. All intercompany balances and transactions have been eliminated.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and related disclosures of contingent liabilities in the unaudited condensed financial statements and accompanying notes. Estimates are used for, but not limited to, clinical accruals, useful lives of equipment, commitments and contingencies, stock-based compensation, and incremental borrowing rate (IBR) used for our lease. Given the global economic and geopolitical climate, these estimates are becoming more challenging, and actual results could differ materially from those estimates.
Gain Related to Sale of Nonfinancial Asset	Gain Related to Sale of Nonfinancial Asset to XOMA (US) LLC On March 29, 2023, we entered into and closed a payment interest purchase agreement (the “Purchase Agreement”) with XOMA (US) LLC (“XOMA”) pursuant to which we sold to XOMA our right, title and interest in all of the deferred payments and a portion of the milestone payments from Medexus pursuant to our LLC Purchase Agreement. Under the terms of the Purchase Agreement, we received $9.6 million at closing (the “Closing Payment”) and an additional post-closing payment of $0.05 million post-closing payment. In exchange for the Closing Payment, the Company sold to XOMA its right, title and interest to the following payments under the LLC Purchase Agreement: (i) 100% of the Company’s entitlement to receive the deferred payments that may become due and payable following March 29, 2023 (including, for avoidance of doubt, any and all payments earned during Q1 2023), (ii) 25% of the milestone payment upon receipt of a Notice of Compliance for IXINITY from Health Canada (the "Canadian Approval Milestone Payment"); and (iii) 50% of the milestone payments upon receipt of regulatory approval in each of Germany, France, the United Kingdom, Spain and Italy (the "European Approval Milestone Payments") and when the worldwide net sales of IXINITY for a fiscal year meet or exceed $120 million (the "Net Sales Milestone Payment"). We accounted for the $9.6 million Closing Payment and the $0.05 million post-closing payment from XOMA as other income in accordance with Accounting Standards Codification (ASC) 610-20 Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets in the first quarter of 2023. Contractual rights sold to XOMA represent an intangible asset under ASC 610-20 Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets for which XOMA bears all benefit and Aptevo has no obligations going forward. The Company will continue to account for its portion of future milestones under our LLC Purchase Agreement with Medexus as contingent consideration under ASC 450-30 Gain Contingencies and will record income when proceeds are received.
Liability Related to Sale of Future Royalties and Non-Cash Interest Expense	Liability Related to Sale of Royalties and Non-Cash Interest Expense On March 30, 2021, we entered into and closed a Royalty Purchase Agreement with HCR pursuant to which we sold to HCR the right to receive royalty payments made by Pfizer in respect of global net sales of RUXIENCE. Under the terms of the Royalty Purchase Agreement, we have received $47.5 million through June 30, 2023 ($35 million at closing and $12.5 million in milestone payments) and we are eligible to receive an additional $10 million based on the achievement of sales milestone 2023. Through March 31, 2022, we accounted for the Royalty Purchase Agreement with HCR as a debt-like instrument, amortized under the effective interest rate method over the life of the related expected royalty stream. The liabilities related to the sale of royalties and the debt amortization were based on our estimates of royalties expected to be paid over the life of the arrangement. We received the 2021 milestone payments in the collective amount of $10 million on March 8, 2022. The proceeds from these milestone payments, net of transaction costs, were recorded as an additional liability related to the sale of royalties on the consolidated balance sheet as of March 31, 2022 pursuant to ASC 470-10-25, Debt – Sales of Future Revenues or Various Other Measures of Income. On June 7, 2022, we entered into and closed an amendment to the Royalty Purchase Agreement (the "Amendment to Royalty Purchase Agreement") (see Note 8) which removed all restrictions related to HCR’s rate of return, and it is no longer a sale of a specified percentage of royalty revenue. The Amendment to Royalty Purchase Agreement was accounted for under ASC 610-20, Gains and Losses from Derecognition of Nonfinancial Assets and ASC 405-20, Liabilities – Extinguishment of Liabilities and the transaction was no longer considered a debt-like financing. As a result of the Amendment to Royalty Purchase Agreement, the Company recognized a gain of $37.2 million in the second quarter of 2022, which was the total balance of liability related to the sale of royalties on the closing date. Future milestone payments will be accounted for as variable consideration and recognized as other income when such milestones are earned using the most likely method in accordance with ASC 610-20 Other Income — Gains and Losses from the Derecognition of Nonfinancial Assets. We received the 2022 milestone payment of $2.5 million on February 28, 2023. The proceeds from the 2022 milestone payment were recorded as other income in the consolidated statement of operations for the year ended December 31, 2022. The Company is eligible to receive an additional milestone payment of $10 million based on achievement of sales milestone in 2023.
Royalty Revenue	Royalty Revenue We recognized revenue in accordance with ASC 606, Revenue from Contracts with Customers. Under ASC 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration that the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of ASC 606, the entity performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. RUXIENCE Royalty Revenue Aptevo’s royalty revenue was exclusively related to royalties on Pfizer’s net sales of RUXIENCE. We did not recognize royalty revenue for the six months ended June 30, 2023. Royalty revenue for the period covered by this report reflects revenue recorded only in the first quarter of 2022 due to our Amendment to Royalty Purchase Agreement with HCR (see Note 8). As a result of the Amendment to Royalty Purchase Agreement, we ceased reporting as royalty revenue, royalties paid by Pfizer to HCR related to Pfizer’s sales of RUXIENCE. We recognized royalty revenue under ASC 606, which provides revenue recognition constraints by requiring the recognition of revenue at the later of the following: (1) when the subsequent sale or usage occurs or (2) when the performance obligation to which some or all of the sales-based or usage-based royalty has been allocated has been satisfied (or partially satisfied). We satisfied our performance obligation prior to the period covered by this report, specifically in May 2011 when the original Collaboration and License Agreement between Trubion Pharmaceuticals and Wyeth was amended to remove the exclusivity/non-compete restrictions so that Pfizer could develop a CD20 biosimilar product in exchange for a one-time payment of $2.5 million and future royalties of 2.5% on any CD20 biosimilar product commercialized by Pfizer in the future. We do not have future performance obligations under this agreement. We applied the royalty recognition constraint required under the guidance for sales-based royalties, which requires a sales-based royalty to be recorded no sooner than the underlying sale. Therefore, royalties on sales of products commercialized by Pfizer were recognized in the quarter the product is sold. Given the royalty revenues were based on 2.5% of global net sales of RUXIENCE, the considerations were considered variable. Pfizer generally reported sales information to us within 60 days of quarter end. Unless we received finalized sales information for the respective quarter, we estimated the expected royalty proceeds based on an analysis of historical experience, analyst expectations, interim data provided by Pfizer, including their publicly announced sales, and other publicly available information. Differences between actual and estimated royalty revenues were adjusted for in the period in which they became known, typically the following quarter. Aptevo did not record revenue for the six months ended June 30, 2023 due to our Amendment to Royalty Purchase Agreement. Revenue recorded for the six months ended June 30, 2022 represents actual royalty revenue given the timing of RUXIENCE sales reports received from Pfizer. There was no significant financing component to the contract.
Debt Modification	Debt Modification On March 29, 2023, we used a portion of the proceeds from our Purchase Agreement with XOMA to fully repay the $2.8 million outstanding principal balance of our MidCap debt, and $0.3 million in exit fees. The pre-payment was not considered an amendment to our Credit Agreement (as defined below) since we were required to fully repay the remaining principal balance if we sold our IXINITY deferred payment stream and milestones.
Other Significant Accounting Policies	Other Significant Accounting Policies Our other significant accounting policies were reported in our Annual Report on Form 10-K for the year ended December 31, 2022 that was filed with the SEC on March 30, 2023. Our other significant accounting policies have not changed materially from the policies previously reported.

Nature of Business and Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2023

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP). These unaudited condensed consolidated financial statements include all adjustments, which include normal recurring adjustments, necessary for the fair presentation of the Company’s financial position. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements as of and for the year ended December 31, 2022, and the notes thereto, which are included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates and changes in these estimates are recorded when known.

The unaudited condensed consolidated financial statements include the accounts of the Company and our wholly owned subsidiary, Aptevo Research and Development LLC. All intercompany balances and transactions have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and related disclosures of contingent liabilities in the unaudited condensed financial statements and accompanying notes. Estimates are used for, but not limited to, clinical accruals, useful lives of equipment, commitments and contingencies, stock-based compensation, and incremental borrowing rate (IBR) used for our lease. Given the global economic and geopolitical climate, these estimates are becoming more challenging, and actual results could differ materially from those estimates.

Gain Related to Sale of Nonfinancial Asset to XOMA (US) LLC

On March 29, 2023, we entered into and closed a payment interest purchase agreement (the “Purchase Agreement”) with XOMA (US) LLC (“XOMA”) pursuant to which we sold to XOMA our right, title and interest in all of the deferred payments and a portion of the milestone payments from Medexus pursuant to our LLC Purchase Agreement. Under the terms of the Purchase Agreement, we received $9.6 million at closing (the “Closing Payment”) and an additional post-closing payment of $0.05 million post-closing payment. In exchange for the Closing Payment, the Company sold to XOMA its right, title and interest to the following payments under the LLC Purchase Agreement: (i) 100% of the Company’s entitlement to receive the deferred payments that may become due and payable following March 29, 2023 (including, for avoidance of doubt, any and all payments earned during Q1 2023), (ii) 25% of the milestone payment upon receipt of a Notice of Compliance for IXINITY from Health Canada (the "Canadian Approval Milestone Payment"); and (iii) 50% of the milestone payments upon receipt of regulatory approval in each of Germany, France, the United Kingdom, Spain and Italy (the "European Approval Milestone Payments") and when the worldwide net sales of IXINITY for a fiscal year meet or exceed $120 million (the "Net Sales Milestone Payment").

We accounted for the $9.6 million Closing Payment and the $0.05 million post-closing payment from XOMA as other income in accordance with Accounting Standards Codification (ASC) 610-20 Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets in the first quarter of 2023. Contractual rights sold to XOMA represent an intangible asset under ASC 610-20 Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets for which XOMA bears all benefit and Aptevo has no obligations going forward. The Company will continue to account for its portion of future milestones under our LLC Purchase Agreement with Medexus as contingent consideration under ASC 450-30 Gain Contingencies and will record income when proceeds are received.

Liability Related to Sale of Royalties and Non-Cash Interest Expense

On March 30, 2021, we entered into and closed a Royalty Purchase Agreement with HCR pursuant to which we sold to HCR the right to receive royalty payments made by Pfizer in respect of global net sales of RUXIENCE. Under the terms of the Royalty Purchase Agreement, we have received $47.5 million through June 30, 2023 ($35 million at closing and $12.5 million in milestone payments) and we are eligible to receive an additional $10 million based on the achievement of sales milestone 2023.

Through March 31, 2022, we accounted for the Royalty Purchase Agreement with HCR as a debt-like instrument, amortized under the effective interest rate method over the life of the related expected royalty stream. The liabilities related to the sale of royalties and the debt amortization were based on our estimates of royalties expected to be paid over the life of the arrangement. We received the 2021 milestone payments in the collective amount of $10 million on March 8, 2022. The proceeds from these milestone payments, net of transaction costs, were recorded as an additional liability related to the sale of royalties on the consolidated balance sheet as of March 31, 2022 pursuant to ASC 470-10-25, Debt – Sales of Future Revenues or Various Other Measures of Income.

On June 7, 2022, we entered into and closed an amendment to the Royalty Purchase Agreement (the "Amendment to Royalty Purchase Agreement") (see Note 8) which removed all restrictions related to HCR’s rate of return, and it is no longer a sale of a specified percentage of royalty revenue. The Amendment to Royalty Purchase Agreement was accounted for under ASC 610-20, Gains and Losses from Derecognition of Nonfinancial Assets and ASC 405-20, Liabilities – Extinguishment of Liabilities and the transaction was no longer considered a debt-like financing.

As a result of the Amendment to Royalty Purchase Agreement, the Company recognized a gain of $37.2 million in the second quarter of 2022, which was the total balance of liability related to the sale of royalties on the closing date. Future milestone payments will be accounted for as variable consideration and recognized as other income when such milestones are earned using the most likely method in accordance with ASC 610-20 Other Income — Gains and Losses from the Derecognition of Nonfinancial Assets. We received the 2022 milestone payment of $2.5 million on February 28, 2023. The proceeds from the 2022 milestone payment were recorded as other income in the consolidated statement of operations for the year ended December 31, 2022. The Company is eligible to receive an additional milestone payment of $10 million based on achievement of sales milestone in 2023.

Royalty Revenue

We recognized revenue in accordance with ASC 606, Revenue from Contracts with Customers. Under ASC 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration that the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of ASC 606, the entity performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation.

RUXIENCE Royalty Revenue

Aptevo’s royalty revenue was exclusively related to royalties on Pfizer’s net sales of RUXIENCE. We did not recognize royalty revenue for the six months ended June 30, 2023. Royalty revenue for the period covered by this report reflects revenue recorded only in the first quarter of 2022 due to our Amendment to Royalty Purchase Agreement with HCR (see Note 8). As a result of the Amendment to Royalty Purchase Agreement, we ceased reporting as royalty revenue, royalties paid by Pfizer to HCR related to Pfizer’s sales of RUXIENCE.

We recognized royalty revenue under ASC 606, which provides revenue recognition constraints by requiring the recognition of revenue at the later of the following: (1) when the subsequent sale or usage occurs or (2) when the performance obligation to which some or all of the sales-based or usage-based royalty has been allocated has been satisfied (or partially satisfied). We satisfied our performance obligation prior to the period covered by this report, specifically in May 2011 when the original Collaboration and License Agreement between Trubion Pharmaceuticals and Wyeth was amended to remove the exclusivity/non-compete restrictions so that Pfizer could develop a CD20 biosimilar product in exchange for a one-time payment of $2.5 million and future royalties of 2.5% on any CD20 biosimilar product commercialized by Pfizer in the future. We do not have future performance obligations under this agreement. We applied the royalty recognition constraint required under the guidance for sales-based royalties, which requires a sales-based royalty to be recorded no sooner than the underlying sale. Therefore, royalties on sales of products commercialized by Pfizer were recognized in the quarter the product is sold.

Given the royalty revenues were based on 2.5% of global net sales of RUXIENCE, the considerations were considered variable. Pfizer generally reported sales information to us within 60 days of quarter end. Unless we received finalized sales information for the respective quarter, we estimated the expected royalty proceeds based on an analysis of historical experience, analyst expectations, interim data provided by Pfizer, including their publicly announced sales, and other publicly available information. Differences between actual and estimated royalty revenues were adjusted for in the period in which they became known, typically the following quarter. Aptevo did not record revenue for the six months ended June 30, 2023 due to our Amendment to Royalty Purchase Agreement. Revenue recorded for the six months ended June 30, 2022 represents actual royalty revenue given the timing of RUXIENCE sales reports received from Pfizer. There was no significant financing component to the contract.

Debt Modification

On March 29, 2023, we used a portion of the proceeds from our Purchase Agreement with XOMA to fully repay the $2.8 million outstanding principal balance of our MidCap debt, and $0.3 million in exit fees. The pre-payment was not considered an amendment to our Credit Agreement (as defined below) since we were required to fully repay the remaining principal balance if we sold our IXINITY deferred payment stream and milestones.

Other Significant Accounting Policies

Our other significant accounting policies were reported in our Annual Report on Form 10-K for the year ended December 31, 2022 that was filed with the SEC on March 30, 2023. Our other significant accounting policies have not changed materially from the policies previously reported.