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Employee Retirement Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Employee retirement plan, description	The plan provides for Company matching of employee contributions up to 5% of eligible earnings.
Contribution expense	$ 2.3	$ 1.3

X

- Definition

Contribution expense.

+ References

No definition available.

+ Details

Name:	prpl_DefinedContributionPlanCostRecognized1
Namespace Prefix:	prpl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Description of nature and type of retirement benefits.

+ References

No definition available.

+ Details

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