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Leases - Narrative (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Jan. 01, 2019
Lessee, Lease, Description [Line Items] |  |  |
Operating lease liabilities | $ 7,243,000 |  | $ 6,847,000
Operating lease right-of-use assets | 6,943,000 | $ 5,434,000 | $ 6,224,000
Lease liabilities not yet commenced | $ 0 |  |
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease terms on operating leases | 1 year |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Remaining lease terms on operating leases | 7 years |  |

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- Definition Lessee, Operating Lease, Lease Not yet Commenced + References No definition available. + Details
Name: | pxlw_LesseeOperatingLeaseLeaseNotYetCommenced
Namespace Prefix: | pxlw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Operating Leases, Remaining Lease Term + References No definition available. + Details
Name: | pxlw_LesseeOperatingLeasesRemainingLeaseTerm
Namespace Prefix: | pxlw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |