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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Shipping and handling costs		$ 706	$ 525
Federal tax rate	21.00%	21.00%	21.00%	35.00%
Uncertain tax positions		$ 0	$ 0		$ 0

X

- Definition

Cost incurred during the reporting period in transporting goods and services to customers.

+ References

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of unrecognized tax benefits.

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