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COMMON STOCK AND STOCK INCENTIVE PLANS - Intrinsic Value (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 29, 2017 | Dec. 30, 2016
2017 Equity Incentive Plan |  |  |  |
Market value of shares as reported by NASDAQ ((in dollars per share) |  |  | $ 5.63 |
Weighted average remaining contractual life of options exercisable | 2 years 29 days | 2 years 1 month 17 days |  |
Weighted average remaining contractual life of options expected to vest | 5 years 11 days | 4 years 5 months 12 days |  |
2006 Equity Incentive Plan |  |  |  |
Market value of shares as reported by NASDAQ ((in dollars per share) |  |  |  | $ 2.0
Weighted average remaining contractual life of options exercisable |  | 2 years 1 month 17 days |  |
Weighted average remaining contractual life of options expected to vest |  | 4 years 5 months 12 days |  |

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