Number of Earnout Shares to the holders of CarLotz Stock as of immediately prior to the effective time of the Merger.

No definition available.

Name:	lotz_EarnoutSharesToHoldersAsOfImmediatelyPriorToTimeOfMerger
Namespace Prefix:	lotz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the stock price trigger over any specified trading days in a consecutive trading day period under a merger.

+ References

No definition available.

+ Details

Name:	lotz_MergerAgreementStockPriceTrigger
Namespace Prefix:	lotz_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the threshold consecutive trading day period in a stock exchange, under a merger agreeement.

+ References

No definition available.

+ Details

Name:	lotz_MergerAgreementThresholdConsecutiveTradingDays
Namespace Prefix:	lotz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days that common stock price is greater within a consecutive trading day period under a merger agreement.

+ References

No definition available.

+ Details

Name:	lotz_MergerAgreementThresholdTradingDays
Namespace Prefix:	lotz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the duration of months following the Closing (the first business day following the end of such period, the "Forfeiture Date").

+ References

No definition available.

+ Details

Name:	lotz_NumberOfTermFollowingClosingForfeitureDate
Namespace Prefix:	lotz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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

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

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=lotz_EarnoutSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=lotz_ScenarioOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=lotz_ScenarioTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Merger - Additional Information (Details) - $ / shares		3 Months Ended		12 Months Ended
Merger - Additional Information (Details) - $ / shares	Jan. 21, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Additional earnout shares receivable	640,421	30,732,442	8,490,120	9,866,462	7,992,280	4,486,439
Share Price	$ 10.00
Earnout shares
Business Acquisition [Line Items]
Additional earnout shares receivable	6,945,732
Share Price	$ 10.00
Earnout shares \| First Threshold
Business Acquisition [Line Items]
Number of months following the closing	60 months
Stock price trigger	$ 12.50
Threshold number of trading days	20 days
Percentage of earnout shares	50.00%
Earnout shares \| Second Threshold
Business Acquisition [Line Items]
Stock price trigger	$ 15.00
Threshold number of trading days	20 days
Threshold consecutive trading days	30 days
Percentage of earnout shares	50.00%