Fair Value Measurements (Quantitative Information) (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($) item
Unsecured Debt [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cash outflows \| $	$ 0.0
Duration	1 year
Unsecured Debt [Member] \| Minimum [Member] \| Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities \| item	0.25
Unsecured Debt [Member] \| Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cash outflows \| $	$ 7.3
Duration	2 years 6 months
Unsecured Debt [Member] \| Weighted Average [Member] \| Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities \| item	0.25
Unsecured Debt [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cash outflows \| $	$ 9.7
Duration	3 years 6 months
Unsecured Debt [Member] \| Maximum [Member] \| Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities \| item	0.25
Secured Debt [Member] \| Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cash outflows \| $	$ 0.0
Duration	1 year
Secured Debt [Member] \| Minimum [Member] \| Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities \| item	0.05
Secured Debt [Member] \| Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cash outflows \| $	$ 46.1
Duration	2 years 6 months
Secured Debt [Member] \| Weighted Average [Member] \| Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities \| item	0.23
Secured Debt [Member] \| Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated cash outflows \| $	$ 70.2
Duration	3 years 6 months
Secured Debt [Member] \| Maximum [Member] \| Estimated Probabilities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Estimated probabilities \| item	0.25

Debt Instrument, Estimated Cash Outflow

No definition available.

Name:	prkr_DebtInstrumentEstimatedCashOutflow
Namespace Prefix:	prkr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Period between issuance and maturity of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- 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

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

- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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- Details

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- Details

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