XML 87 R77.htm IDEA: XBRL DOCUMENT v3.20.2

Operating Segments and Enterprise-Wide Information - Revenue by Segment, Recognition Type, and Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 157,824	$ 138,018	$ 318,577	$ 270,231
Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	133,784	113,637	268,499	221,740
Systems
Disaggregation of Revenue [Line Items]
Revenues	24,040	24,381	50,078	48,491
China
Disaggregation of Revenue [Line Items]
Revenues	48,758	20,355	92,400	42,198
China | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	45,625	16,304	82,905	34,455
China | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,133	4,051	9,495	7,743
Taiwan
Disaggregation of Revenue [Line Items]
Revenues	33,171	14,872	29,201	54,894
Taiwan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	29,806	12,826	27,941	52,378
Taiwan | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,365	2,046	1,260	2,516
United States
Disaggregation of Revenue [Line Items]
Revenues	28,121	38,369	60,037	72,632
United States | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	22,368	32,072	47,979	59,727
United States | Systems
Disaggregation of Revenue [Line Items]
Revenues	5,753	6,297	12,058	12,905
South Korea
Disaggregation of Revenue [Line Items]
Revenues	15,113	28,171	64,951	37,259
South Korea | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	14,249	27,360	60,245	34,083
South Korea | Systems
Disaggregation of Revenue [Line Items]
Revenues	864	811	4,706	3,176
Europe
Disaggregation of Revenue [Line Items]
Revenues	14,132	10,648	35,175	20,141
Europe | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	8,767	4,474	24,977	9,847
Europe | Systems
Disaggregation of Revenue [Line Items]
Revenues	5,365	6,174	10,198	10,294
Japan
Disaggregation of Revenue [Line Items]
Revenues	10,059	16,093	14,363	10,946
Japan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	6,679	12,867	8,802	9,052
Japan | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,380	3,226	5,561	1,894
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues	6,500	7,683	18,429	26,525
Asia-Pacific | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	4,347	6,262	12,214	18,167
Asia-Pacific | Systems
Disaggregation of Revenue [Line Items]
Revenues	2,153	1,421	6,215	8,358
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	1,970	1,827	4,021	5,636
Rest of the world | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	1,943	1,472	3,436	4,031
Rest of the world | Systems
Disaggregation of Revenue [Line Items]
Revenues	27	355	585	1,605
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	155,756	136,367	314,683	267,000
Products transferred at a point in time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	133,208	113,028	267,277	220,519
Products transferred at a point in time | Systems
Disaggregation of Revenue [Line Items]
Revenues	22,548	23,339	47,406	46,481
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	2,068	1,651	3,894	3,231
Services transferred over time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	576	609	1,222	1,221
Services transferred over time | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,492	1,042	2,672	2,010
Foundry & Logic
Disaggregation of Revenue [Line Items]
Revenues	109,347	73,442	215,092	145,022
Foundry & Logic | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	109,347	73,442	215,092	145,022
Foundry & Logic | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
DRAM
Disaggregation of Revenue [Line Items]
Revenues	19,052	36,044	43,748	64,930
DRAM | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	19,052	36,044	43,748	64,930
DRAM | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Flash
Disaggregation of Revenue [Line Items]
Revenues	5,385	4,151	9,659	11,788
Flash | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	5,385	4,151	9,659	11,788
Flash | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems
Disaggregation of Revenue [Line Items]
Revenues	24,040	24,381	50,078	48,491
Systems | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems | Systems
Disaggregation of Revenue [Line Items]
Revenues	$ 24,040	$ 24,381	$ 50,078	$ 48,491

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=form_ProbeCardsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=form_SystemsSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_CN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_TW
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_KR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_JP
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=form_RestOfTheWorldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredAtPointInTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredOverTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=form_FoundryLogicProductGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=form_DRAMProductGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=form_FlashProductGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=form_SystemsProductGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: