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Commitments and Contingencies - Additional Information (Details)	Sep. 30, 2019 USD ($)
Commitments And Contingencies [Line Items]
Legal Contingency	$ 10,253,122
Other Current Assets
Commitments And Contingencies [Line Items]
Gain Contingency	$ 10,300,000

X

- Definition

Accrued legal contingencies current.

+ References

No definition available.

+ Details

Name:	frpt_AccruedLegalContingenciesCurrent
Namespace Prefix:	frpt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

Name:	frpt_CommitmentsAndContingenciesLineItems
Namespace Prefix:	frpt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12053-110248

+ Details

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

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: