Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Inventory reserves $ 13,064,000 $ 4,619,000
Inventory scrap losses $ 587,000 $ 699,000