v3.20.1

Summary of Business and Significant Accounting Principles - Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2019
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	39 years
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	6 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Vehicles and prototypes | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Vehicles and prototypes | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: