XML 68 R52.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Balance Sheet Components (Schedule of Changes in Carrying Value of Long-term Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract] |  |  |  |
Beginning Balance |  | $ 7,758 | [1] | $ 8,147
Additions |  | 340 |  | 5,850
Disposals |  | (1,499) |  |
Impairment and downward adjustments for observable price changes |  | (549) |  | (6,239)
Upward adjustments for observable price changes |  | 253 |  |
Ending Balance | [1] | $ 6,303 |  | $ 7,758
[1] | The balances excluded the investment in limited partnership fund of $0.9 million and $0.6 million, as of December 31, 2021 and 2020, respectively. Additionally, the balance as of December 31, 2021 excluded an investment in convertible debt securities of $0.3 million.

X
- Definition Equity securities without readily determinable fair value amount additions. + References No definition available. + Details
Name: | ntgr_EquitySecuritiesWithoutReadilyDeterminableFairValueAmountAdditions
Namespace Prefix: | ntgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity securities without readily determinable fair value amount disposal. + References No definition available. + Details
Name: | ntgr_EquitySecuritiesWithoutReadilyDeterminableFairValueAmountDisposal
Namespace Prefix: | ntgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_BalanceSheetRelatedDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of impairment loss on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration