Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation The Company is involved in various lawsuits, claims and other legal matters from time to time that arise in the ordinary course of conducting business. The Company records a liability when a particular contingency is probable and estimable. In February 2021, a putative securities class action complaint was filed against the Company and certain of its current and former officers in the U.S. District Court for the Eastern District of New York on behalf of a class consisting of those who acquired the Company’s securities between October 2, 2019 and February 1, 2021. The complaint alleges that the Company and certain of its officers violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, by making false and misleading statements regarding the safety of batoclimab and seeks unspecified monetary damages on behalf of the putative class and an award of costs and expenses, including reasonable attorneys’ fees. On December 29, 2021, the U.S. District Court appointed a lead plaintiff. On February 1, 2022, the lead plaintiff filed an amended complaint adding RSL and the Company’s directors and underwriters as defendants and asserting additional claims under Section 11, 12(a)(2), and 15 of the Securities Act of 1933 on behalf of a putative class consisting of those who purchased or otherwise acquired the Company’s securities pursuant and/or traceable to the Company’s follow-on public offering on or about September 2, 2020. On March 15, 2022, the lead plaintiff filed a further amended complaint. On February 14, 2023, the court granted the lead plaintiffs leave to amend. On March 17, 2023, the lead plaintiff filed a second amended complaint. The Company and other defendants served motions to dismiss the second amended complaint on April 28, 2023. The fully briefed motions to dismiss, including defendants’ opening briefs, lead plaintiff’s opposition, and defendants’ replies were filed with the court on June 30, 2023. No hearing date has been set. The Company intends to continue to vigorously defend the case and has not recorded a liability related to this lawsuit because, at this time, the Company is unable to reasonably estimate possible losses or determine whether an unfavorable outcome is either probable or remote. Commitments During the year ended March 31, 2022, ISG entered into the PSA with Samsung to manufacture a certain quantity of batoclimab drug substance for, among other things, commercial sale, if approved. As of September 30, 2023, in connection with this agreement, the Company has a remaining minimum obligation to Samsung of approximately $18.7 million, of which $3.5 million, $2.5 million and $12.7 million is expected to be paid during the remainder of the fiscal year ending March 31, 2024, and for the fiscal years ending March 31, 2025 and 2026, respectively. During the three and six months ended September 30, 2023, the Company recorded $0.6 million and $1.3 million, respectively, of research and development expenses related to the PSA and during the three and six months ended September 30, 2022, the Company recorded $1.7 million of research and development expenses related to the PSA. The Company made cash payments of $14.6 million related to the PSA during the six months ended September 30, 2023. Of the amount expected to be paid during the remainder of the fiscal year ending March 31, 2024, $3.2 million was included in accrued expenses in the accompanying unaudited condensed consolidated balance sheet as of September 30, 2023. See Note 3 - Material Agreements for additional details. As of September 30, 2023, the Company did not have any other ongoing material contractual obligations for which cash flows were fixed and determinable. In the normal course of business, the Company enters into agreements with CROs for clinical trials and with vendors for nonclinical studies, manufacturing and other services and products for operating purposes, which agreements are generally cancellable by the Company at any time, subject to payment of remaining obligations under binding purchase orders and, in certain cases, nominal early-termination fees. These commitments are not deemed significant. There are certain contracts wherein the Company has a minimum purchase commitment, however, most of it is due and payable within one year. Contingencies The extent of the impact of the post-COVID-19 environment, geopolitical tensions and global slowdown of economic activity, changes in inflation, rising interest rates and a potential recession in the U.S. on the Company’s future operational and financial performance will depend on certain developments, including the potential impact on our clinical trial plans and timelines, such as the enrollment, activation and initiation of additional clinical trial sites, and the results of our clinical trials, all of which are uncertain and cannot be predicted. At this point, the extent to which these events may impact the Company’s future financial condition or results of operations is uncertain.