EMPLOYEE BENEFIT PLAN (Details) - USD ($) $ in Thousands		12 Months Ended
Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Employee minimum service period	60 days	6 months
Employee maximum annual contribution	$ 19	$ 15
Annual vesting percentage of company contributions	25.00%	25.00%
Vesting term	4 years	5 years
Employer match percentage of employee contribution	100.00%	20.00%
Maximum annual match, percentage of gross salary	6.00%	10.00%
Plan expense		$ 300	$ 200	$ 200

Defined Benefit Plan, Minimum Service Period

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- Definition

Defined Benefit Plan, Vesting Term

+ References

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- References

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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- Definition

Percentage employer matches of the employee's percentage contribution matched.

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- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

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- Definition

Maximum amount the employee may contribute to a defined contribution plan.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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