Name:	fsrd_CommitmentAmountRemainingNoncancellableFutureMinimumPaymnetsDueOnThisFirmPurchaseAgreement
Namespace Prefix:	fsrd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and contingencies.

No definition available.

Name:	fsrd_CommitmentsAndContingenciesLineItems
Namespace Prefix:	fsrd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Payment made to related party upon close of the merger.

No definition available.

Name:	fsrd_PaymentMadeToRelatedPartyUponCloseOfTheMerger
Namespace Prefix:	fsrd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Subscription agreement, commitment amount for utilization of software and services with related party.

No definition available.

Name:	fsrd_SubscriptionAgreementcommitmentAmountForUtilizationOfSoftwareAndServicesWithRelatedParty
Namespace Prefix:	fsrd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349