The combined up-front and milestone payments per the collaboration agreement.

No definition available.

Name:	lqda_CollaborationAgreementCombinedUpFrontAndMilestonePayments
Namespace Prefix:	lqda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The milestone payment received per the collaboration agreement.

+ References

No definition available.

+ Details

Name:	lqda_CollaborationAgreementMilestonePayment
Namespace Prefix:	lqda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The non-refundable up-front fee received.

+ References

No definition available.

+ Details

Name:	lqda_NonRefundableUpFrontFee
Namespace Prefix:	lqda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The non-refundable payment to be received under the collaboration agreement.

+ References

No definition available.

+ Details

Name:	lqda_NonrefundablePaymentToBeReceived
Namespace Prefix:	lqda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The remaining unamortized balance of deferred revenue that was recorded as revenues due to the termination of the development and license agreement.

+ References

No definition available.

+ Details

Name:	lqda_UnamortizedDeferredRevenueRecordedAsRevenue
Namespace Prefix:	lqda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The remaining unamortized balance of deferred sublicense payments that was recorded as cost of sales due to the termination of the development and license agreement.

+ References

No definition available.

+ Details

Name:	lqda_UnamortizedDeferredSublicensePaymentsRecordedAsCostOfSales
Namespace Prefix:	lqda_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

+ Details

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

- Details

Name:	srt_MajorCustomersAxis=lqda_GskInhaledMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=lqda_GWLaboratoriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenue From Contracts With Customers - Additional information (Details) - USD ($) $ in Millions	1 Months Ended				9 Months Ended	12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Feb. 29, 2016	Sep. 30, 2015	Sep. 30, 2019	Dec. 31, 2018
GSK Inhaled
Revenue From Contracts With Customers
Non-refundable payment to be received				$ 15.0
Milestone payment received			$ 3.0
Combined up-front and milestone payments		$ 18.0
Revenue recognized					$ 8.1
G & W
Revenue From Contracts With Customers
Non-refundable up-front fee	$ 1.0
Unamortized balance of deferred revenue that was recorded as revenues due to the termination of the development and license agreement						$ 0.9
Unamortized balance of deferred sublicense payments that was recorded as cost of sales due to the termination of the development and license agreement						$ 0.1