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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 |  |

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- Definition Amount, before accumulated depreciation and amortization, of property, plant, and equipment, excluding underlying asset under operating lease. Amount, before accumulated depreciation and amortization, of property, plant, and equipment, excluding underlying asset under operating lease. Amount, before accumulated depreciation and amortization, of property, plant, and equipment, excluding underlying asset under operating lease. Amount, before accumulated depreciation and amortization, of property, plant, and equipment, excluding underlying asset under operating lease. + References No definition available. + Details
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