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Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment at cost | $ 3,155 |  | $ 3,155 |  | $ 2,984
Less: accumulated depreciation | (2,735) |  | (2,735) |  | (2,595)
Property and equipment, net | 420 |  | 420 |  | 389
Depreciation | 48 | $ 77 | 140 | $ 277 |
Equipment |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment at cost | 1,353 |  | $ 1,353 |  | 1,297
Equipment | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life |  |  | 3 years |  |
Equipment | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life |  |  | 15 years |  |
Tooling |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment at cost | 226 |  | $ 226 |  | 203
Tooling | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life |  |  | 2 years |  |
Tooling | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life |  |  | 5 years |  |
Vehicles |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life |  |  | 5 years |  |
Property and equipment at cost | 47 |  | $ 47 |  | 47
Furniture and fixtures |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life |  |  | 5 years |  |
Property and equipment at cost | 137 |  | $ 137 |  | 137
Computer software |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Useful life |  |  | 3 years |  |
Property and equipment at cost | 1,062 |  | $ 1,062 |  | 1,028
Leasehold improvements |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment at cost | 210 |  | 210 |  | 211
Finance lease right-of-use asset |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment at cost | 13 |  | 13 |  | 13
Projects in progress |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and equipment at cost | $ 107 |  | $ 107 |  | $ 48

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