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Stock-Based Compensation - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs) [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of RSUs, Non-vested, beginning balance 463 247 267
Stock units issued 1,604 402 131
Number of RSUs, Vested (231) (135) (121)
Number of RSUs, Canceled (842) (51) (30)
Number of RSUs, Non-vested, ending balance | shares 994 463 247
Weighted Average Fair Value per Share, Non-vested, beginning balance $ 7.59 $ 11.99 $ 11.79
Weighted Average Fair Value per Share, Granted 2.79 6.47 12.12
Weighted Average Fair Value per Share, Vested 2.87 11.94 11.92
Weighted Average Fair Value per Share, Canceled 3.65 8.48 11.05
Weighted Average Fair Value per Share, Non-vested, ending balance $ 3.35 $ 7.59 $ 11.99