XML 83 R70.htm IDEA: XBRL DOCUMENT v3.19.1

Commitments (Details Narrative)	1 Months Ended				6 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($) ft²	Apr. 30, 2017 USD ($) ft²	Apr. 30, 2012 USD ($)	Jul. 31, 2011 ft²	Jun. 30, 2014 USD ($) ft²	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2014 ft²
Irrevocable and unconditional standby letter of credit						$ 749,369	$ 665,373
Payment of lease						$ 457,321	$ 502,716
EGEN Asset Purchase Agreement [Member]
Area of premises | ft²					11,500
Lease term					1 year
Operating lease, description						On February 1, 2019, we amended the current terms of the lease to increase the size of the premises by 2,285 square feet to 9,850 square feet and also extended the lease term by one year to September 1, 2023. In conjunction with the February 1, 2019 lease amendment, we agreed to modify our one-time option to cancel the lease as of the 36th month after the May 1, 2017 lease commencement date
Operating leases, monthly rent payment in final year					$ 23,200
Standby Letter of Credit [Member]
Contractual obligation reduction nineteen months from initial term			$ 50,000
Contractual obligation remaining			100,000
Lawrenceville New Jersey [Member]
Area of premises | ft²		7,565		10,870
Lease term		64 months		66 months
The number of months in which free rent is provided		4 months		6 months
Payment for rent			23,000
Operating leases, monthly rent payment in first year		$ 18,900
Operating leases, monthly rent payment in final year		$ 20,500
Lawrenceville New Jersey [Member] | Standby Letter of Credit [Member]
Irrevocable and unconditional standby letter of credit			$ 250,000
Huntsville Alabama [Member] | EGEN Asset Purchase Agreement [Member]
Area of premises | ft²	9,049							2,285
Lease term	60 months
Operating leases, monthly rent payment	$ 18,100

X

- Definition

Represents the reduction of the contractual obligation that will occur nineteen months from initial term.

+ References

No definition available.

+ Details

Name:	CLSN_ContractualObligationReductionNineteenMonthsFromInitialTerm
Namespace Prefix:	CLSN_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The remaining amount due under contractual obligations.

+ References

No definition available.

+ Details

Name:	CLSN_ContractualObligationRemaining
Namespace Prefix:	CLSN_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The number of months in which free rent is provided.

+ References

No definition available.

+ Details

Name:	CLSN_NumberOfMonthsInWhichFreeRentIsProvided
Namespace Prefix:	CLSN_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the payment to be paid each month under an operating lease.

+ References

No definition available.

+ Details

Name:	CLSN_OperatingLeasesMonthlyRentPayment
Namespace Prefix:	CLSN_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the payment to be paid each month in the final year under an operating lease.

+ References

No definition available.

+ Details

Name:	CLSN_OperatingLeasesMonthlyRentPaymentInFinalYear
Namespace Prefix:	CLSN_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the payment to be paid each month in the first year under an operating lease.

+ References

No definition available.

+ Details

Name:	CLSN_OperatingLeasesMonthlyRentPaymentInFirstYear
Namespace Prefix:	CLSN_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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

X

- Definition

Description of lessee's operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

+ Details

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

X

- Definition

Cash payments to lessor's for use of assets under operating leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585

+ Details

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

X

- Details

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

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=CLSN_LawrencevilleNewJerseyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=CLSN_HuntsvilleAlabamaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: