Stockholders' Equity - Summary of Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 25, 2021	Dec. 31, 2020
Temporary Equity [Line Items]
Shares Authorized	135,936,731	135,936,731
Shares Issued	114,686,731	114,686,731
Shares Outstanding	114,686,731	114,686,731
Aggregate Liquidation Amount	$ 100,187	$ 100,187
Proceeds Net of Issuance Cost	99,414	99,414
Net Carrying Value	$ 86,706	$ 86,706
Series A
Temporary Equity [Line Items]
Shares Authorized	17,000,000	17,000,000
Shares Issued	17,000,000	17,000,000
Shares Outstanding	17,000,000	17,000,000
Per Share Liquidation Preference	$ 1.00	$ 1.00
Aggregate Liquidation Amount	$ 17,000	$ 17,000
Proceeds Net of Issuance Cost	16,982	16,982
Net Carrying Value	$ 16,982	$ 16,982
Series B
Temporary Equity [Line Items]
Shares Authorized	25,186,738	25,186,738
Shares Issued	25,186,738	25,186,738
Shares Outstanding	25,186,738	25,186,738
Per Share Liquidation Preference	$ 1.00	$ 1.00
Aggregate Liquidation Amount	$ 25,187	$ 25,187
Proceeds Net of Issuance Cost	24,943	24,943
Net Carrying Value	$ 12,235	$ 12,235
Series B-1
Temporary Equity [Line Items]
Shares Authorized	93,749,993	93,749,993
Shares Issued	72,499,993	72,499,993
Shares Outstanding	72,499,993	72,499,993
Per Share Liquidation Preference	$ 0.80	$ 0.80
Aggregate Liquidation Amount	$ 58,000	$ 58,000
Proceeds Net of Issuance Cost	57,489	57,489
Net Carrying Value	$ 57,489	$ 57,489