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SHARE-BASED COMPENSATION - Summary of Warrant Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Dec. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Number of warrants, exercisable |  |  | 64,482
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) |  |  | $ 13.84
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Intrinsic Value [Roll Forward] |  |  |
Options converted |  | 22,240 |
Warrant |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued in period |  | 423 |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Number of warrants, outstanding, beginning balance (in shares) | 64,482 |  |
Number of warrants, outstanding, ending balance (in shares) | 25,862 |  | 64,482
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) | $ 13.84 |  |
Outstanding warrants, weighted average exercise price, ending balance (in dollars per share) | 16.80 |  | $ 13.84
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 | 10 months 24 days |  | 9 months 18 days
Exercisable warrants, weighted average remaining contractual life | 10 months 24 days |  | 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Intrinsic Value [Roll Forward] |  |  |
Outstanding warrants, intrinsic value, beginning balance | $ 473 |  |
Outstanding warrants, intrinsic value, ending balance | 0 |  | $ 473
Exercisable warrants, intrinsic price | $ 0 |  | $ 473
Options converted |  | 1,020 |
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares issued in period |  | 9,298 |

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