XML 61 R48.htm IDEA: XBRL DOCUMENT
v3.24.1.1.u2

REDEEMABLE CONVERTIBLE PREFERRED STOCK ESCROWED PROCEEDS AND STOCKHOLDERS EQUITY (Details Narrative) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 11, 2022 | Feb. 29, 2024 | Oct. 20, 2023 | Dec. 16, 2022 | Oct. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Jan. 31, 2024 | Jun. 30, 2021 | Jun. 30, 2020
Stock based compensation, options |  |  |  |  |  | $ 205,176 |  | $ 121,584 | $ 382,541 | $ 615,716 |  |  |  |  |  |
Number of common stock share |  |  |  |  | 798,182 |  |  |  |  | 1,033,491 |  | 1,033,491 |  |  |  |
Exercise price per share |  |  | $ 2.12 |  | $ 5.83 |  |  |  |  |  |  |  |  | $ 5.46 |  |
Fees and expenses |  |  | $ 4,573,948 |  | $ 9,109,117 |  |  |  |  | $ 9,224,056 |  |  |  |  |  |
Gross proceeds |  |  |  |  |  |  |  |  |  | $ 10,000,006,000,000 |  |  |  |  |  |
Voting of shares description |  |  |  |  |  |  |  |  |  | The holders of Series C Preferred Stock were entitled to 20,000 votes per share |  |  |  |  |  |
Exercise price |  |  | $ 0.0001 |  | $ 0.0001 | $ 6.82 |  |  |  | $ 6.82 |  |  |  |  |  |
Description of commission |  |  |  |  |  |  |  |  |  | The Company pays Canaccord 3.0% of the gross proceeds as a commission |  |  |  |  |  |
Unvested performance-based restricted stock |  |  |  |  |  |  |  |  |  |  |  | $ 238,838 | $ 60,566 |  | $ 95,167 | $ 87,303
Unvested performance-based stock options granted to executive officers and other employees |  |  |  |  |  | 318,813 |  |  |  | 318,813 |  |  |  |  |  |
Unvested performance-based stock options granted |  |  |  |  |  | 57,999 |  |  |  | 57,999 |  |  |  |  |  |
Stock based compensation, restricted stock units |  |  |  |  |  | $ 185,019 | $ 202,512 |  |  | $ 555,057 | $ 612,132 |  |  |  |  |
Outstanding vested restricted stock unit |  |  |  |  |  | 279,700 |  |  |  | 279,700 |  |  |  |  |  |
Description of securities purchase agreement |  | the Company issued to the investors in the January 2024 RD Offering unregistered warrants (the “January 2024 Private Warrants”) to purchase up to 1,831,503 shares of the Company’s common stock (the “January 2024 Private Warrant Shares”) in a concurrent private placement (the “Private Offering” and together with the January 2024 RD Offering, the “January 2024 Offering”). The shares of common stock and accompanying January 2024 Private Warrants were offered at a combined offering price of $5.46 | (i) 1,325,000 shares of common stock (the “October 2023 Shares”), of the Company and (ii) pre-funded warrants (the “October 2023 Pre-Funded Warrants”) to purchase up to 1,033,491 shares of the Company’s common stock (the “October 2023 Pre-Funded Warrant Shares”). Pursuant to the October 2023 Purchase Agreement the Company also issued unregistered warrants (the “October 2023 Private Warrants”) to purchase up to 2,358,491 shares of the Company’s common stock (the “October 2023 Private Warrant Shares”) in a concurrent private placement (the “October 2023 Private Offering” and together with the October 2023 RD Offering, the “October 2023 Offering”). The October 2023 Shares and accompanying October 2023 Private Warrants were offered at a combined offering price of $2.12. The October 2023 Pre-Funded Warrants and accompanying October 2023 Private Warrants were offered at a combined offering price of $2.1199 |  | (i) 1,020,000 shares of the Company’s common stock, (ii) prefunded warrants (the “October 2022 Pre-Funded Warrants”) to purchase up to 798,182 shares of the Company’s common stock, and (iii) common stock warrants (the “October 2022 Common Warrants”) to purchase up to 1,818,182 shares of the Company’s common stock. Each share of common stock was offered with one accompanying October 2022 Common Warrant with a combined offering price of $5.50. Each October 2022 Pre-Funded Warrant was offered with one accompanying October 2022 Common Warrant with a combined offering price of $5.4999 |  |  |  |  |  |  |  |  |  |  |
Total gross proceeds |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |
Account to release |  |  |  |  |  |  |  |  |  | 171,000,000 |  |  |  |  |  |
Distributable value of dividend |  |  |  |  |  | $ 100 |  |  |  | 100 |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  | $ 2,033,410 | $ 3,537,376 |  |  | $ 8,266,267 | $ 10,220,518 |  |  |  |  |
Executive Officers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested performance-based stock options granted to executive officers and other employees |  |  |  |  |  | 217,833 |  |  |  | 217,833 |  |  |  |  |  |
Unvested performance-based stock options granted |  |  |  |  |  | 37,116 |  |  |  | 37,116 |  |  |  |  |  |
Unvested performance-based restricted stock units granted |  |  |  |  |  |  |  |  |  |  |  | 152,432 | 40,707 |  | 22,343 | 52,679
Convertible Series A Preferred Stocks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock were outstanding |  |  |  |  |  | 4,030 |  |  |  | 4,030 |  |  |  |  |  |
Aggregate value |  |  |  |  |  |  |  |  |  | $ 403,000 |  |  |  |  |  |
Conversion price |  |  |  |  |  | $ 75.45 |  |  |  | $ 75.45 |  |  |  |  |  |
Convertible shares |  |  |  |  |  | $ 1.33 |  |  |  | $ 1.33 |  |  |  |  |  |
Distributable value of dividend |  |  |  |  |  | $ 100 |  |  |  | $ 100 |  |  |  |  |  |
Distributable value of dividend additional |  |  |  |  |  | $ 100 |  |  |  | 100 |  |  |  |  |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee |  |  |  |  |  |  |  |  |  | 750,000 |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,995 |  |  |
Fair value of the warrants |  |  |  |  |  |  |  |  |  |  |  |  | $ (234,443) |  |  |
Securities Purchase Agreement Plan [Member] | Series B and C Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price | $ 12.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Account to release |  |  |  |  |  |  |  |  |  | 15,750,000 |  |  |  |  |  |
Fee |  |  |  |  |  |  |  |  |  | 750,000 |  |  |  |  |  |
Warrants to purchase up | 66,666 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gross proceeds from the offering |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |
Expiry of share issuance | 48 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Purchase Agreement [Member] | Series B Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold | 8,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities Purchase Agreement [Member] | Series C Redeemable Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares sold | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share purchase price | $ 1.67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 Stock Incentive Plan [Member] | President and CEO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntarily contributed stock options number of share |  |  |  | 143,360 |  |  |  |  |  |  |  |  |  |  |  |
2011 Stock Incentive Plan [Member] | CFO and COO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntarily contributed stock options number of share |  |  |  | 124,220 |  |  |  |  |  |  |  |  |  |  |  |
2023 Equity Distribution Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of equity distribution agreement |  |  |  |  |  |  |  |  |  | The 2023 Equity Distribution Agreement and related prospectus is limited to sales of up to an aggregate maximum $50.0 million of shares of the Company’s common stock |  |  |  |  |  |
Vesting of restricted share units |  |  |  |  |  |  |  |  |  | 25,467 |  |  |  |  |  |
Vesting of restricted share units value aggregate |  |  |  |  |  |  |  |  |  | $ 56,401 |  |  |  |  |  |

X
- References No definition available. + Details
Name: | ptn_AggregateValue
Namespace Prefix: | ptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | ptn_AggregateValueOfShareVestingRestrictedUnits
Namespace Prefix: | ptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | ptn_CashAvailableForDistributionsAdditional
Namespace Prefix: | ptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | ptn_ContributionOfNumberOfShare
Namespace Prefix: | ptn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

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

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

X
- References No definition available. + Details
Name: | ptn_ExpiryOfShareIssuance
Namespace Prefix: | ptn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ptn_GrossProceeds
Namespace Prefix: | ptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ptn_NumberOfShareVestingRestrictedUnits
Namespace Prefix: | ptn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ptn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVesteOutstandingNumber
Namespace Prefix: | ptn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ptn_UnvestedPerformanceBasedRestrictedStockUnitsGranted
Namespace Prefix: | ptn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ptn_UnvestedPerformanceBasedStockOptionsGranted
Namespace Prefix: | ptn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ptn_UnvestedPerformanceBasedStockOptionsGrantedToExecutiveOfficersAndOtherEmployees
Namespace Prefix: | ptn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ptn_UnvestedPerformancesBasedRestrictedStockUnit
Namespace Prefix: | ptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- References No definition available. + Details
Name: | ptn_WarrantToPurchaseCommonStock
Namespace Prefix: | ptn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase from purchase of accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-11 + Details
Name: | us-gaap_AccountsReceivablePurchase
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash eligible for distribution to members or limited partners of limited liability company (LLC) or limited partnership (LP), subject to reserves to be maintained as defined in operating or partnership agreement, or in a credit facility agreement. + References No definition available. + Details
Name: | us-gaap_CashAvailableForDistributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_CostsAndExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share excess of preference in liquidation over convertible debt instrument's if-converted par or stated value of share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B + Details
Name: | us-gaap_DebtInstrumentConvertibleLiquidationPreferencePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 25 -Paragraph 13 -SubTopic 10 -Topic 480 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481766/480-10-25-13 + Details
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_LegalFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share conversion price of preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 + Details
Name: | us-gaap_PreferredStockConvertibleConversionPrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(16)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_PreferredStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Cash received from grantors during the current period related to operating activities. This element represents receipts from a guarantor for the amount of guarantee provided. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-25 + Details
Name: | us-gaap_ProceedsFromGrantors
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
Name: | us-gaap_ProceedsFromIssuanceInitialPublicOffering
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_RestrictedStockExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_SellingGeneralAndAdministrativeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of noncash expense for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_StockOptionPlanExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481004/946-505-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of increase (decrease) in shares of stock classified as other. + References No definition available. + Details
Name: | us-gaap_StockholdersEquityOtherShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=ptn_ExecutiveOfficersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=ptn_ConvertibleSeriesAPreferredStocksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=ptn_SeriesBConvertiblePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=ptn_SecuritiesPurchaseAgreementPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=ptn_SeriesBAndCRedeemableConvertiblePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=ptn_SecuritiesPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=ptn_SeriesBRedeemableConvertiblePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=ptn_SeriesCRedeemableConvertiblePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=ptn_TwentyElevenStockIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_PresidentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ptn_CFOandCOOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=ptn_TwentyTwentyThreeEquityDistributionAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |