Investments (Details) $ in Millions	Mar. 31, 2021 USD ($)
Mastery Logistics System, Inc.
Schedule of Equity Method Investments [Line Items]
Value of ownership interest in investment	$ 5.0
Ownership interest in investment	5.00%
TuSimple
Schedule of Equity Method Investments [Line Items]
Value of ownership interest in investment	$ 5.0

Amount of investment in equity security without readily determinable fair value.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant