Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
Dec. 31, 2022	Jul. 31, 2022	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitment to acquire equipment and services	$ 7.4
Cumulative purchases made to date	7.4
Reimbursement received from government agency	7.4
Amount purchased	0.2
Remaining accounts payable to vendors	0.1
Contract for epiwafer technology			$ 0.9
Option in addition to contract for epiwafer technology			$ 0.5
Amounts billed and received on government contracts	0.4
Purchase commitment		$ 2.8
Remaining amount to be paid on the commitment	$ 1.4

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity must commit resources to supply goods or services to one or more customers.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a)(19))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.17)
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant