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Commitments and Contingencies - Summary of Amortization and Interest Expense Related to Capital Leases (Details) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Amortization and Interest Expense Related to Capital Leases [Abstract]
Depreciation and amortization	$ 231	$ 2,282	$ 3,173
Interest expense	$ 26	$ 206	$ 395

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- Definition

Amortization and Interest Expense Related to Capital Leases [Abstract]

+ References

No definition available.

+ Details

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Period Type:	duration

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- Definition

Capital leases depreciation and amortization expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	fa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 35
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123396583&loc=d3e43161-112731

+ Details

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