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Property and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment at cost |  | $ 3,375 | $ 3,411 |
Less: accumulated depreciation |  | (2,765) | (2,314) |
Property and equipment, net |  | 610 | 1,097 |
Depreciation |  | 522 | 681 | $ 805
Impairment loss on equipment and software |  |  | 200 | 900
Gain on sale |  | $ (2) | (203) | $ (38)
Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment, useful life |  | 2 years |  |
Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment, useful life |  | 15 years |  |
Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment at cost |  | $ 1,511 | $ 1,557 |
Net proceeds | $ 200 |  |  |
Gain on sale | $ 15 |  |  |
Equipment | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment, useful life |  |  | 3 years | 3 years
Equipment | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment, useful life |  |  | 15 years | 15 years
Tooling |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment at cost |  | 371 | $ 371 |
Tooling | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment, useful life |  |  | 2 years | 2 years
Tooling | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment, useful life |  |  | 5 years | 5 years
Vehicles |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment at cost |  | 47 | $ 47 |
Property and equipment, useful life |  |  | 5 years | 5 years
Furniture and fixtures |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment at cost |  | 137 | $ 137 |
Property and equipment, useful life |  |  | 5 years | 5 years
Computer software |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment at cost |  | 1,043 | $ 1,043 |
Property and equipment, useful life |  |  | 3 years | 3 years
Leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment at cost |  | 211 | $ 201 |
Construction in progress |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property and equipment at cost |  | $ 55 | $ 55 |

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