Property and Equipment (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Property, Plant and Equipment [Line Items] |
|
|
|
| Property and equipment at cost |
$ 5,258
|
$ 3,130
|
|
| Less: accumulated depreciation |
(2,829)
|
(2,674)
|
|
| Property, Plant and Equipment, Net |
2,429
|
456
|
|
| Depreciation |
$ 266
|
184
|
$ 615
|
| 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 |
$ 2,864
|
$ 1,289
|
|
| 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 |
$ 851
|
$ 851
|
|
| 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 |
$ 39
|
$ 0
|
|
| Property and equipment, useful life |
5 years
|
5 years
|
|
| Furniture and fixtures |
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
| Property and equipment at cost |
$ 104
|
$ 85
|
|
| Property and equipment, useful life |
5 years
|
5 years
|
|
| Computer software |
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
| Property and equipment at cost |
$ 581
|
$ 378
|
|
| Property and equipment, useful life |
3 years
|
3 years
|
|
| Leasehold improvements |
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
| Property and equipment at cost |
$ 509
|
$ 509
|
|
| Construction in progress |
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
| Property and equipment at cost |
$ 310
|
$ 18
|
|