Equity-Based Compensation - Employee Stock Purchase Plan Activities (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018
Employee Stock Purchase Plan [Line Items]
Shares purchased	370	411
Weighted-average purchase price per share	$ 3.96	$ 3.98
Aggregate intrinsic value of purchase rights exercised	$ 513	$ 750

Number of shares issued during the period as a result of an employee stock purchase plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Name:	us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration