Litigation	6 Months Ended
Jun. 30, 2022
Disclosure Text Block Supplement [Abstract]
Litigation	10. Litigation Eversana Arbitration On May 19, 2022, Eversana filed a Demand for Arbitration claiming approximately $4.4 million in damages against the Company with the American Arbitration Association entitled, Eversana Life Sciences, LLC. v. Humanigen, Inc. (AAA Case No. 01-21-0018-0523). The Demand contains two breach of contract claims related to the Eversana Agreement between the parties and a related agreement between the companies’ European subsidiaries, and a claim for unjust enrichment. Eversana asserts that the Company failed to pay it amounts due for work preparing for the potential commercializing of lenzilumab performed between April 1, 2021 and September 30, 2021. The Company denies Eversana’s claims and assertions that amounts are owing and is prepared to defend itself vigorously. Avid Arbitration On December 17, 2021, Avid Bioservices, Inc. (“Avid”) filed a Demand for Arbitration claiming more than $20.5 million in damages against the Company with the American Arbitration Association entitled, Avid Bioservices, Inc. v. Humanigen, Inc. (AAA Case No. 01-21-0018-0523). The Demand contains three claims for: (1) Breach of Contract concerning the Process Development and Manufacturing Master Services Agreement; (2) Anticipatory Breach of Contract concerning the Capacity Expansion and Contribution/Commitment letter; and (3) Trade Libel and Commercial Disparagement. Avid claims that the Company canceled the contract after Avid was unable to successfully produce any full batches of lenzilumab BDS, but that the Company still owes the full amount due under the contract for all batches under the contract. Avid blamed its failed attempts on a subcontractor. To date, the Company has paid Avid $10.6 million, despite Avid not being able to produce any full BDS batches. On January 6, 2022, the Company filed an Answer to Avid’s Demand, denying the allegations and asserting affirmative defenses. On July 1, 2022, the Company filed its own lawsuit against Avid in Orange County Superior Court asserting claims for: (1) Breach of Contract; (2) Declaratory Relief; and (3) Unfair Business Practices. Savant Litigation The Company was previously involved in litigation against Savant Neglected Diseases, LLC (“Savant”). In March 2022, the Company and Savant reached a confidential settlement. Accordingly, the litigation involving Savant was dismissed on March 31, 2022.

Litigation

6 Months Ended

Jun. 30, 2022

Disclosure Text Block Supplement [Abstract]

10. Litigation

Eversana Arbitration

On May 19, 2022, Eversana filed a Demand for Arbitration claiming approximately $4.4 million in damages against the Company with the American Arbitration Association entitled, Eversana Life Sciences, LLC. v. Humanigen, Inc. (AAA Case No. 01-21-0018-0523). The Demand contains two breach of contract claims related to the Eversana Agreement between the parties and a related agreement between the companies’ European subsidiaries, and a claim for unjust enrichment. Eversana asserts that the Company failed to pay it amounts due for work preparing for the potential commercializing of lenzilumab performed between April 1, 2021 and September 30, 2021. The Company denies Eversana’s claims and assertions that amounts are owing and is prepared to defend itself vigorously.

Avid Arbitration

On December 17, 2021, Avid Bioservices, Inc. (“Avid”) filed a Demand for Arbitration claiming more than $20.5 million in damages against the Company with the American Arbitration Association entitled, Avid Bioservices, Inc. v. Humanigen, Inc. (AAA Case No. 01-21-0018-0523). The Demand contains three claims for: (1) Breach of Contract concerning the Process Development and Manufacturing Master Services Agreement; (2) Anticipatory Breach of Contract concerning the Capacity Expansion and Contribution/Commitment letter; and (3) Trade Libel and Commercial Disparagement. Avid claims that the Company canceled the contract after Avid was unable to successfully produce any full batches of lenzilumab BDS, but that the Company still owes the full amount due under the contract for all batches under the contract. Avid blamed its failed attempts on a subcontractor. To date, the Company has paid Avid $10.6 million, despite Avid not being able to produce any full BDS batches.

On January 6, 2022, the Company filed an Answer to Avid’s Demand, denying the allegations and asserting affirmative defenses. On July 1, 2022, the Company filed its own lawsuit against Avid in Orange County Superior Court asserting claims for: (1) Breach of Contract; (2) Declaratory Relief; and (3) Unfair Business Practices.

Savant Litigation

The Company was previously involved in litigation against Savant Neglected Diseases, LLC (“Savant”). In March 2022, the Company and Savant reached a confidential settlement. Accordingly, the litigation involving Savant was dismissed on March 31, 2022.