Related Party Transactions (Details) - USD ($)					3 Months Ended		6 Months Ended
	Apr. 28, 2022	Dec. 29, 2021	Dec. 01, 2021	Jul. 06, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 13, 2022	Dec. 31, 2021	Dec. 28, 2021	Jul. 31, 2021	Apr. 08, 2021
Related Party Transaction [Line Items]
Selling, general and administrative expenses					$ 19,115,000	$ 11,325,000	$ 33,394,000	$ 20,127,000
Standby Equity Purchase Agreement
Related Party Transaction [Line Items]
Common stock standby equity purchase agreement	$ 200,000,000
Each sale aggregate value	$ 20,000,000
Share price as percentage of market price	97.00%
Sale of stock, percentage of ownership after transaction	9.99%
Sale of stock ownership threshold after exchange cap percent	19.99%
Maximum borrowing capacity under agreement	$ 50,000,000
Equity interests issued or issuable number of shares issued (in shares)	465,117
Derivative instruments in hedges, assets, at fair value	$ 0				0		0
Cash received on issuance of shares							$ 5,000,000
Sale of stock, number of shares issued in transaction (in shares)							3,967,939
Standby Equity Purchase Agreement | Yorkville
Related Party Transaction [Line Items]
Sale of stock, number of shares issued in transaction (in shares)							4,433,056
Ownership interest							8.00%
2021 Convertible Notes without embedded derivative liability
Related Party Transaction [Line Items]
Interest expense					2,558,000		$ 4,731,000
Gain (loss) on beneficial conversion feature					3,978,000		11,673,000
Principal-Installment				$ 100,000,000
Yorkville Convertible Note
Related Party Transaction [Line Items]
Payment made for debt issuance cost							125,000
Interest expense					108,000		108,000
Principal-Installment					7,500,000		7,500,000		$ 7,500,000
Interest expense					$ 108,000		$ 108,000
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						22,516,000		30,368,000
Affiliated Entity | B. Riley Securities, Inc
Related Party Transaction [Line Items]
Due from related parties, current						$ 432,000		$ 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