Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT, NET (Details)

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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 26,831   $ 26,831   $ 26,733
Less accumulated depreciation (19,427)   (19,427)   (18,894)
Property and equipment, net 7,404   7,404   7,839
Depreciation expense 500 $ 500 1,500 $ 1,600  
Tooling and equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 13,400   $ 13,400   13,465
Furniture and other equipment          
Property, Plant and Equipment [Line Items]          
Useful life     5    
Property and equipment, gross 7,785   $ 7,785   7,379
Computer software          
Property, Plant and Equipment [Line Items]          
Useful life     5    
Property and equipment, gross 1,987   $ 1,987   2,378
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 3,467   $ 3,467   3,314
Equipment under capital lease          
Property, Plant and Equipment [Line Items]          
Useful life     5    
Property and equipment, gross $ 192   $ 192   $ 197
Minimum | Tooling and equipment          
Property, Plant and Equipment [Line Items]          
Useful life     7    
Minimum | Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Useful life     3     
Maximum | Tooling and equipment          
Property, Plant and Equipment [Line Items]          
Useful life      15    
Maximum | Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Useful life      6