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SHARE-BASED COMPENSATION - Summary of Stock Option and Restricted Stock Activity (Details) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2019 USD ($) $ / shares shares | Dec. 30, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Exercised (in shares) | (38,614) |
Stock options and restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Beginning number of shares, outstanding (in shares) | 526,985 |
Granted (in shares) | 138,750 |
Exercised (in shares) | (47,790) |
Forfeited / Canceled (in shares) | (34,700) |
Number of shares, outstanding (in shares) | 583,245 | 526,985
Ending number of shares, options exercisable | 295,045 | 238,085
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward] |  |
Beginning balance of options outstanding (in dollars per share) | $ / shares | $ 16.49 |
Granted (in dollars per share) | $ / shares | 21.49 |
Exercised (in dollars per share) | $ / shares | 10.19 |
Forfeited / Canceled (in dollars per share) | $ / shares | 14.39 |
Ending balance of options outstanding (in dollars per share) | $ / shares | 18.32 | $ 16.49
Options exercisable at end of period | $ / shares | $ 16.37 | $ 13.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Roll Forward] |  |
Options outstanding, weighted average remaining contractual term | 7 years 9 months 18 days | 7 years 8 months 12 days
Optons exercisable, weighted average remaining contractual term | 7 years 1 month 6 days | 7 years 2 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Roll Forward] |  |
Beginning balance, intrinsic value | $ | $ 2,932 |
Ending value, intrinsic value | $ | 2,109 | $ 2,932
Options exercisable, aggregate intrinsic value | $ | $ 1,379 | $ 1,684
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |
Nonvested, number of shares | 288,200 | 288,900
Nonvested options, weighted average grant date fair value | $ / shares | $ 7.73 | $ 8.34

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Roll Forward] + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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