Litigation Settlement, Future Milestone Payments, Percent

No definition available.

Name:	lsta_LitigationSettlementFutureMilestonePaymentsPercent
Namespace Prefix:	lsta_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Litigation Settlement, Milestone Payment

+ References

No definition available.

+ Details

Name:	lsta_LitigationSettlementMilestonePayment
Namespace Prefix:	lsta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Research Collaboration and License Agreement, Option to Terminate

+ References

No definition available.

+ Details

Name:	lsta_ResearchCollaborationAndLicenseAgreementOptionToTerminate
Namespace Prefix:	lsta_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue, Performance Obligation, Percentage of Net Sale

+ References

No definition available.

+ Details

Name:	lsta_RevenuePerformanceObligationPercentageOfNetSale
Namespace Prefix:	lsta_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Revenue, Performance Obligation, Percentage of Sublicensing Revenues

+ References

No definition available.

+ Details

Name:	lsta_RevenuePerformanceObligationPercentageOfSublicensingRevenues
Namespace Prefix:	lsta_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Revenue, Remaining Performance Obligation, Variable Consideration Amount

+ References

No definition available.

+ Details

Name:	lsta_RevenueRemainingPerformanceObligationVariableConsiderationAmount
Namespace Prefix:	lsta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

+ Details

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

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

+ Details

Name:	us-gaap_ContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of revenue from collaborative arrangement. Excludes revenue from contract with customer under Topic 606.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-SubTopic 10
-Topic 808
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479428/808-10-45-3

+ Details

Name:	us-gaap_RevenueFromCollaborativeArrangementExcludingRevenueFromContractWithCustomer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_LitigationCaseAxis=lsta_LingmedLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=lsta_ExclusiveLicenseAndCollaborationAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=lsta_QiluMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_LicenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=lsta_KuvaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Research Collaboration and License Agreement (Details) - USD ($)		1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 14, 2022	Nov. 30, 2024	Feb. 28, 2021	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 25, 2024
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue from contract				$ 0	$ 0	$ 0	$ 0
Lingmed Limited
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Litigation settlement, future milestone payments								5.00%
Litigation settlement, first milestone payment								$ 250,000
Exclusive License and Collaboration Agreement \| Qilu \| License
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Contract with customer, liability			$ 10,000,000
Revenue from contract	$ 5,000,000
Option to terminate			60 days
Exclusive License and Collaboration Agreement \| Qilu \| License \| Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Variable consideration amounts, milestones			$ 96,000,000
Percentage of net sale			10.00%
Percentage of sublicensing revenues			12.00%
Exclusive License and Collaboration Agreement \| Qilu \| License \| Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Variable consideration amounts, milestones			$ 125,000,000
Percentage of net sale			15.00%
Percentage of sublicensing revenues			35.00%
Exclusive License and Collaboration Agreement \| Kuva \| License
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue from contract		$ 1,000,000
Percentage of net sale		5.00%
Percentage of sublicensing revenues		50.00%
Exclusive License and Collaboration Agreement \| Kuva \| License \| Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Variable consideration amounts, milestones		$ 1,500,000
Exclusive License and Collaboration Agreement \| Kuva \| License \| Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Variable consideration amounts, milestones		$ 17,500,000