Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitment with a Government Agency In connection with a contract with a government agency, the Company entered into commitments to acquire equipment and services from vendors totaling $7.4 million, all of which is reimbursable. Under this contract, which expired in December 2022, the Company made total purchases of $7.4 million as of December 31, 2022, of which $7.4 million was reimbursed by the government agency as of December 31, 2022. During the nine months ended December 31, 2022, the Company made purchases of $0.2 million and remaining accounts payable to the vendors was $0.1 million as of December 31, 2022. In September 2021, the Company was awarded a $0.9 million contract with a $0.5 million option by a government agency for delivering epiwafer technology and the expiration date of the contract is May 2023. During the nine months ended December 31, 2022, the Company billed and received $0.4 million related to such contract. Cooperation Agreement On December 30, 2022, and effective as of December 18, 2022, the Company entered into a cooperation agreement (the “Cooperation Agreement”) with GaNext (Zhuhai) Technology Co., Ltd (“GaNext”). Among other things, the Cooperation Agreement calls for certain royalties including a royalty due to the Company in the event that GaNext utilizes epiwafers not provided by the Company (such royalties are based on time and volume with a minimum floor), and a royalty payable by the Company in the event the Company utilizes certain future platform that may be developed independently by GaNext (such royalties are based on time and volume, and half the amount per wafer of the royalties GaNext would pay the Company when utilizing epiwafers not provided by the Company). Other Commitment In July 2022, the Company placed an order for a reactor from Aixtron, Inc. for a total purchase price of $2.8 million. As of December, 31 2022, the Company had $1.4 million remaining to be paid on the commitment. Contingencies During the ordinary course of business, the Company may become a party to legal proceedings incidental to its business. The Company accrues contingent liabilities when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. Legal cost is expensed as incurred. On April 5, 2022, Joel Newman, an alleged holder of the Company’s common stock, filed a complaint in the Delaware Court of Chancery derivatively against the Company’s directors and KKR Phorm Investors L.P. (“Phorm”). The complaint alleges that the directors and Phorm breached their fiduciary duties, and the directors committed waste, because the terms of the November 5, 2021 private placement in which Phorm participated were unfairly favorable to Phorm. The directors have the right to advancement from the Company of expenses incurred defending the claims. On July 11, 2022, plaintiff filed an amended complaint, on which the parties completed briefing on January 9, 2023. A hearing on the motion to dismiss is scheduled for May 9, 2023. The Company is unable to estimate the potential loss or range of loss, if any, associated with this lawsuit. The Company is not aware of any material legal claims or assessments other than disclosed above. Although the results of litigation and claims are inherently unpredictable, management believes (in consultation with legal counsel) there was not at least a reasonable possibility that the Company had incurred a material loss with respect to any loss contingencies as of December 31, 2022 and through the issuance of these financial statements. Indemnification The Company from time to time enters into types of contracts that contingently require the Company to indemnify parties against third-party claims. These contracts primarily relate to: (1) real estate leases, under which the Company may be required to indemnify property owners for environmental and other liabilities and for other claims arising from the Company’s use of the applicable premises; (2) agreements with the Company’s officers, directors, and employees, under which the Company may be required to indemnify such persons from liabilities arising out of their relationship; (3) indemnifying customers in the event of product failure; and (4) agreements with outside parties that use the Company’s intellectual property, under which the Company may indemnify for copyright or patent infringement related specifically to the use of such intellectual property. Historically, the Company has not been required to make payments under these obligations, and no liabilities have been recorded for these obligations in the Company’s consolidated financial statements.