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PROPERTY AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT, NET PROPERTY AND EQUIPMENT, NET
Property and equipment, net consist of the following as of December 31, 2021 and 2020 (in thousands):
20212020
Machinery and equipment$2,868 $2,217 
Furniture and fixtures90 90 
Leasehold improvements746 677 
Construction in process2,517 — 
Total property and equipment6,221 2,984 
Less accumulated depreciation(1,720)(1,148)
Total property and equipment, net$4,501 $1,836 
Depreciation expense was $572 thousand and $436 thousand for the years ended December 31, 2021 and 2020, respectively.