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SHARE-BASED COMPENSATION - Summary of Warrant Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 28, 2021 | Dec. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |
Number of warrants, exercisable |  | 25,862
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward] |  |
Exercisable warrants, weighted average exercise price (in dollars per share) |  | $ 16.80
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Intrinsic Value [Roll Forward] |  |
Options converted | 600 |
Warrant |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |
Number of warrants, outstanding, beginning balance (in shares) | 25,862 |
Number of warrants, outstanding, ending balance (in shares) | 25,862 | 25,862
Number of warrants, exercisable | 25,862 |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward] |  |
Outstanding warrants, weighted average exercise price, beginning balance (in dollars per share) | $ 16.80 |
Outstanding warrants, weighted average exercise price, ending balance (in dollars per share) | 16.80 | $ 16.80
Exercisable warrants, weighted average exercise price (in dollars per share) | $ 16.80 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |
Warrants outstanding, weighted average remaining contractual life | 2 months 12 days | 4 months 24 days
Exercisable warrants, weighted average remaining contractual life | 2 months 12 days | 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Intrinsic Value [Roll Forward] |  |
Outstanding warrants, intrinsic value, beginning balance | $ 0 |
Outstanding warrants, intrinsic value, ending balance | 0 | $ 0
Exercisable warrants, intrinsic price | $ 0 | $ 0

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