INCOME TAXES - Unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019
Income Tax Disclosure [Abstract]
Texas research and development tax credit carryforwards			$ 1,900
Unrecognized tax benefits (excluding interest and penalties)
Balance, beginning of year	$ 2,381	$ 1,064
Gross increases related to current year tax positions	987	1,350
Gross increases related to prior year tax positions	37	0
Gross decreases related to prior year tax positions	0	(14)
Lapse of statute of limitations	(47)	(19)
Balance, end of year	3,358	2,381
Unrecognized tax benefits	$ 3,358	$ 1,064	3,358
Liability of interest and penalties related to unrecognized tax benefits			$ 300

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research and development tax credit carryforwards.

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