XML 50 R44.htm IDEA: XBRL DOCUMENT
v3.26.1

Equity and Debt Securities - Summary of Investment in Equity and Debt Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Less: Cash equivalents, Carrying Value | $ (5,108) | $ (18,398)
Less: Cash equivalents, Fair Value | (5,108) | (18,398)
Equity and debt securities, Amortized Cost Basis | 541,910 | 666,231
Equity and debt securities, Unrealized Gains | 462 | 4,068
Equity and debt securities, Unrealized Losses | (2,328) | (145)
Equity and debt securities, Aggregate Fair Value | 540,044 | 670,154
Debt Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 526,909 | 651,230
Debt securities, Unrealized Gains | 462 | 4,068
Debt securities, Unrealized Losses | (2,328) | (145)
Debt securities, Aggregate Fair Value | 525,043 | 655,153
Short-Term Marketable Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 230,468 | 284,869
Debt securities, Unrealized Gains | 266 | 1,038
Debt securities, Unrealized Losses | (7) | (23)
Debt securities, Aggregate Fair Value | 230,727 | 285,884
Short-Term Marketable Securities | U.S. Government Debt Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 156,278 | 159,875
Debt securities, Unrealized Gains | 220 | 748
Debt securities, Unrealized Losses |  | (1)
Debt securities, Aggregate Fair Value | 156,498 | 160,622
Short-Term Marketable Securities | U.S. Agency Debt Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 32,960 | 86,786
Debt securities, Unrealized Gains | 11 | 133
Debt securities, Unrealized Losses | (4) | (1)
Debt securities, Aggregate Fair Value | 32,967 | 86,918
Short-Term Marketable Securities | Corporate Debt Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 40,855 | 37,333
Debt securities, Unrealized Gains | 35 | 157
Debt securities, Unrealized Losses | (3) | (16)
Debt securities, Aggregate Fair Value | 40,887 | 37,474
Short-Term Marketable Securities | Municipal Bonds |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 375 | 375
Debt securities, Aggregate Fair Value | 375 | 375
Short-Term Marketable Securities | Yankee Debt Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis |  | 500
Debt securities, Unrealized Losses |  | (5)
Debt securities, Aggregate Fair Value |  | 495
Short-Term Marketable Securities | Money Market Accounts |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 5,108 | 18,398
Debt securities, Aggregate Fair Value | 5,108 | 18,398
Long Term Equity Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Marketable and non-marketable securities, Amortized Cost Basis | 15,001 | 15,001
Marketable and non-marketable securities, Aggregate Fair Value | 15,001 | 15,001
Long Term Equity Securities | Preferred Stock Of Privately Held Company |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Marketable and non-marketable securities, Amortized Cost Basis | 15,001 | 15,001
Marketable and non-marketable securities, Aggregate Fair Value | 15,001 | 15,001
Debt Securities due After 1 Year through 5 Years |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 296,441 | 366,361
Debt securities, Unrealized Gains | 196 | 3,030
Debt securities, Unrealized Losses | (2,321) | (122)
Debt securities, Aggregate Fair Value | 294,316 | 369,269
Debt Securities due After 1 Year through 5 Years | U.S. Government Debt Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 246,904 | 284,857
Debt securities, Unrealized Gains | 195 | 2,821
Debt securities, Unrealized Losses | (1,688) | (67)
Debt securities, Aggregate Fair Value | 245,411 | 287,611
Debt Securities due After 1 Year through 5 Years | U.S. Agency Debt Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 48,617 | 70,567
Debt securities, Unrealized Gains |  | 123
Debt securities, Unrealized Losses | (630) | (51)
Debt securities, Aggregate Fair Value | 47,987 | 70,639
Debt Securities due After 1 Year through 5 Years | Corporate Debt Securities |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis |  | 9,922
Debt securities, Unrealized Gains |  | 85
Debt securities, Aggregate Fair Value |  | 10,007
Debt Securities due After 1 Year through 5 Years | Municipal Bonds |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Debt securities, Amortized Cost Basis | 920 | 1,015
Debt securities, Unrealized Gains | 1 | 1
Debt securities, Unrealized Losses | (3) | (4)
Debt securities, Aggregate Fair Value | $ 918 | $ 1,012

X
- Definition Available for sale securities debt equity securities and trading securities. + References No definition available. + Details
Name: | flgt_AvailableForSaleSecuritiesDebtEquitySecuritiesAndTradingSecurities
Namespace Prefix: | flgt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available for sale securities debt, equity securities and trading securities amortized cost basis. + References No definition available. + Details
Name: | flgt_AvailableForSaleSecuritiesDebtEquitySecuritiesAndTradingSecuritiesAmortizedCostBasis
Namespace Prefix: | flgt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Available for sale securities debt, equity securities and trading securities unrealized gain before tax. + References No definition available. + Details
Name: | flgt_AvailableForSaleSecuritiesDebtEquitySecuritiesAndTradingSecuritiesUnrealizedGainBeforeTax
Namespace Prefix: | flgt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Available for sale securities debt, equity securities and trading securities unrealized loss before tax. + References No definition available. + Details
Name: | flgt_AvailableForSaleSecuritiesDebtEquitySecuritiesAndTradingSecuritiesUnrealizedLossBeforeTax
Namespace Prefix: | flgt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash equivalents. + References No definition available. + Details
Name: | flgt_CashEquivalents
Namespace Prefix: | flgt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481830/320-10-45-1 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 + Details
Name: | us-gaap_EquitySecuritiesFvNi
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_EquitySecuritiesFvNiCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B + Details
Name: | us-gaap_ScheduleOfTradingSecuritiesAndOtherTradingAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=flgt_ShortTermMarketableSecuritesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AgencySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=flgt_YankeeDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=flgt_LongTermEquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=flgt_PreferredStockOfPrivatelyHeldCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=flgt_DebtSecuritiesDueAfterOneYearThroughFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |