Average trading period from date of purchase right.

No definition available.

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- Definition

Market value of shares to be purchased under each right.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptla_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of separate rights to purchase shares of common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptla_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of manufacturing commitments.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Balance Type:	debit
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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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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Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e2646-109256

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Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Details

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Contract Manufacturing Agreements - Additional Information (Detail)	1 Months Ended	3 Months Ended
	Aug. 31, 2017 USD ($) right $ / shares shares	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($) $ / shares shares
Long-term Purchase Commitment [Line Items]
Share based compensation		$ 9,480,000	$ 17,894,000
Lonza Manufacturing Services Agreement
Long-term Purchase Commitment [Line Items]
Term of manufacturing commitments	10 years
Lonza Manufacturing Services Agreement \| Nonemployee Stock \| Research and Development Expense
Long-term Purchase Commitment [Line Items]
Share based compensation			$ 5,800,000
Lonza Manufacturing Services Agreement \| Second Tranche
Long-term Purchase Commitment [Line Items]
Share based compensation		$ 0
Lonza Manufacturing Services Agreement \| Common Stock
Long-term Purchase Commitment [Line Items]
Number of separate rights to purchase shares of common stock \| right	2
Follow on offering price per share \| $ / shares	$ 1.00
Average trading period from date of purchase right	20 days
Lonza Manufacturing Services Agreement \| Common Stock \| First Tranche
Long-term Purchase Commitment [Line Items]
Transfer and exercised the right to purchase (in shares) \| shares			500,000
Transfer and exercised the right to purchase price (in dollars per share) \| $ / shares			$ 1.00
Lonza Manufacturing Services Agreement \| Common Stock \| Maximum
Long-term Purchase Commitment [Line Items]
Aggregate market value of shares to be purchased under each right	$ 15,000,000.0
Number of shares to be purchased under each rights \| shares	500,000