XML 71 R74.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Share-Based Compensation - Schedule of Information with Respect to Outstanding and Exercisable Stock Options (Detail) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Options Outstanding | 2,437,609 | 2,818,433 | 2,868,053 | 3,085,888
Options Outstanding, Weighted Average Exercise Price | $ 9.32 | $ 9.59 | $ 9.86 | $ 11.18
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 5 years 6 months 3 days |  |  |
Options Exercisable, Number Exercisable | 1,895,851 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 9.08 |  |  |
Range of Exercise Prices $2.82 - $4.07 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 2.82 |  |  |
Range of Exercise Prices, Maximum | $ 4.07 |  |  |
Options Outstanding, Number of Options Outstanding | 280,632 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 3.71 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 4 years 8 months 15 days |  |  |
Options Exercisable, Number Exercisable | 280,632 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 3.71 |  |  |
Range of Exercise Prices $4.15 - $4.15 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 4.15 |  |  |
Range of Exercise Prices, Maximum | $ 4.15 |  |  |
Options Outstanding, Number of Options Outstanding | 250,732 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 4.15 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 5 years 7 months 9 days |  |  |
Options Exercisable, Number Exercisable | 250,732 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 4.15 |  |  |
Range of Exercise Prices $4.49 - $4.49 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 4.49 |  |  |
Range of Exercise Prices, Maximum | $ 4.49 |  |  |
Options Outstanding, Number of Options Outstanding | 607,648 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 4.49 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 6 years 2 months 4 days |  |  |
Options Exercisable, Number Exercisable | 436,872 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 4.49 |  |  |
Range of Exercise Prices $5.00 - $6.51 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 5.00 |  |  |
Range of Exercise Prices, Maximum | $ 6.51 |  |  |
Options Outstanding, Number of Options Outstanding | 302,032 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 6.02 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 4 years 4 months 24 days |  |  |
Options Exercisable, Number Exercisable | 302,032 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 6.02 |  |  |
Range of Exercise Prices $7.22 - $8.30 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 7.22 |  |  |
Range of Exercise Prices, Maximum | $ 8.30 |  |  |
Options Outstanding, Number of Options Outstanding | 258,023 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 8.21 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 6 years 10 months 13 days |  |  |
Options Exercisable, Number Exercisable | 133,473 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 8.12 |  |  |
Range of Exercise Prices $9.69 - $13.15 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 9.69 |  |  |
Range of Exercise Prices, Maximum | $ 13.15 |  |  |
Options Outstanding, Number of Options Outstanding | 84,065 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 9.90 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 6 years 8 months 23 days |  |  |
Options Exercisable, Number Exercisable | 84,065 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 9.90 |  |  |
Range of Exercise Prices $13.80 - $13.80 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 13.80 |  |  |
Range of Exercise Prices, Maximum | $ 13.80 |  |  |
Options Outstanding, Number of Options Outstanding | 266,312 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 13.80 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 8 years 2 months 4 days |  |  |
Options Exercisable, Number Exercisable | 61,838 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 13.80 |  |  |
Range of Exercise Prices $15.39 - $22.13 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 15.39 |  |  |
Range of Exercise Prices, Maximum | $ 22.13 |  |  |
Options Outstanding, Number of Options Outstanding | 226,653 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 20.23 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 4 years 7 months 9 days |  |  |
Options Exercisable, Number Exercisable | 184,695 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 20.00 |  |  |
Range of Exercise Prices $29.02 - $29.02 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 29.02 |  |  |
Range of Exercise Prices, Maximum | $ 29.02 |  |  |
Options Outstanding, Number of Options Outstanding | 41,512 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 29.02 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 2 months 1 day |  |  |
Options Exercisable, Number Exercisable | 41,512 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 29.02 |  |  |
Range of Exercise Prices $30.67 - $30.67 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of Exercise Prices, Minimum | 30.67 |  |  |
Range of Exercise Prices, Maximum | $ 30.67 |  |  |
Options Outstanding, Number of Options Outstanding | 120,000 |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 30.67 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Term (in Years) | 4 months 17 days |  |  |
Options Exercisable, Number Exercisable | 120,000 |  |  |
Options Exercisable, Weighted Average Exercise Price | $ 30.67 |  |  |

X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
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 No definition available. + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=prdo_RangeOfExercisePricesTenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |