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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred taxes, net
Net operating loss carryforward	$ 324	$ 236
Accruals	22	11
Reserves	11	8
Property, plant and equipment, and intangible assets	28	48
Stock-based compensation expense	132	125
Other	10	7
Total deferred tax assets	527	435
Net deferred tax assets	$ 527	$ 435

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