XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.22.1

Common Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Class Of Stock [Line Items] |  |  |
Net proceeds from issuance of common stock |  |  | $ 161,424
Common Stock |  |  |
Class Of Stock [Line Items] |  |  |
Common stock, voting rights |  | The holders of the voting common stock are entitled to one vote for each share of voting common stock held at all meetings of stockholders |
Common Stock | Minimum |  |  |
Class Of Stock [Line Items] |  |  |
Beneficial ownership percentage |  | 9.99% |
Common Stock | Maximum |  |  |
Class Of Stock [Line Items] |  |  |
Beneficial ownership percentage |  | 19.99% |
Common Stock | Follow-on Offering |  |  |
Class Of Stock [Line Items] |  |  |
Number of shares sold | 2,875,000 |  |
Public offering price | $ 60.00 |  |
Net proceeds from issuance of common stock | $ 161,400 |  |

X
- Definition Beneficial ownership percentage. + References No definition available. + Details
Name: | prld_BeneficialOwnershipPercentage
Namespace Prefix: | prld_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_CommonStockVotingRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=prld_FollowOnOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |