Related Party Transactions (Details) - USD ($)				3 Months Ended
	Dec. 29, 2021	Dec. 01, 2021	Jul. 06, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 28, 2021	Jul. 31, 2021	Apr. 08, 2021
Related Party Transaction [Line Items]
Interest payable - related party				$ 1,544,000		$ 0
Selling, general and administrative expenses				14,279,000	$ 8,802,000
Loss contingency accrual				900,000
2021 Convertible Note without embedded derivative liability
Related Party Transaction [Line Items]
Contractual interest expense accrued						2,900,000
Interest expense				2,174,000	0
Gain (loss) on beneficial conversion feature				7,695,000
Interest payable - related party				1,544,000		0
Hellman Parties | Dilutive Effect Prior to Merger Agreement
Related Party Transaction [Line Items]
Equity interest issued or issuable (in shares)	159,977	300,000
Spring Creek Capital, LLC
Related Party Transaction [Line Items]
Notes receivable, related parties								$ 100,000,000
B. Riley Securities, Inc
Related Party Transaction [Line Items]
Payment made for debt issuance cost			$ 3,000,000
Equity Method Investee | Holtec International
Related Party Transaction [Line Items]
Selling, general and administrative expenses				$ 0	7,852,000
Affiliated Entity | B. Riley Securities, Inc
Related Party Transaction [Line Items]
Due from related parties, current					$ 432,000
Hellman Parties | Dilutive Effect Prior to Merger Agreement
Related Party Transaction [Line Items]
Estimated litigation liability									$ 5,000,000
Settlement deductible									$ 2,000,000
Loss contingency accrual						$ 1,200,000	$ 1,200,000
Loss contingency accrual, payments	$ 1,200,000
Loss contingency accrual, share equivalent (in shares)							140,023