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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 26,642   $ 26,642   $ 26,733
Less accumulated depreciation (18,965)   (18,965)   (18,894)
Property and equipment, net 7,677   7,677   7,839
Depreciation expense 500 $ 500 1,000 $ 1,100  
Tooling and equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 13,303   $ 13,303   13,465
Furniture and other equipment          
Property, Plant and Equipment [Line Items]          
Useful life     5    
Property and equipment, gross 7,651   $ 7,651   7,379
Computer software          
Property, Plant and Equipment [Line Items]          
Useful life     5    
Property and equipment, gross 2,026   $ 2,026   2,378
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 3,470   $ 3,470   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