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
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 27,175   $ 26,733
Less accumulated depreciation (19,404)   (18,894)
Property and equipment, net 7,771   7,839
Depreciation expense 500 $ 600  
Tooling and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 13,636   13,465
Furniture and other equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 7,567   7,379
Useful Life In Years 5 years    
Computer software      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 2,378   2,378
Useful Life In Years 5 years    
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 3,397   3,314
Equipment under capital lease      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 197   $ 197
Useful Life In Years 5 years    
Minimum | Tooling and equipment      
Property, Plant and Equipment [Line Items]      
Useful Life In Years 7 years    
Minimum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Useful Life In Years 3 years    
Maximum | Tooling and equipment      
Property, Plant and Equipment [Line Items]      
Useful Life In Years 15 years    
Maximum | Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Useful Life In Years 6 years