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Fair Value Measurements - Additional Information (Details)	Sep. 30, 2020 USD ($)
Fair Value Disclosures [Abstract]
Fair value transfers between levels	$ 0

X

- Definition

Fair value transfers between levels.

+ References

No definition available.

+ Details

Name:	fulc_FairValueTransfersBetweenLevels
Namespace Prefix:	fulc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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