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Earn-out Milestone Liability (Details Narrative) - USD ($)		3 Months Ended				9 Months Ended		12 Months Ended
	Jun. 20, 2014	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Fair value of Acquisition consideration		$ 9,000,000	$ 13,100,000	$ 12,500,000	$ 13,800,000
Gain (loss) from change in fair value of earn out milestone liability		$ 4,100,000		$ 1,300,000		$ (3,567,671)
Minimum [Member]
Risk adjusted assessment of each milestone		0.00%	35.00%	35.00%	50.00%	0.00%	35.00%	35.00%	50.00%
Estimated time to achieve the milestone			9 months 29 days		1 year 6 months	0 years	1 year 2 months 30 days	1 year 3 months 29 days	2 years
Maximum [Member]
Risk adjusted assessment of each milestone		80.00%	80.00%	80.00%	80.00%	80.00%	80.00%	80.00%	80.00%
Estimated time to achieve the milestone			1 year		2 years	1 year 2 months 1 day	1 year 9 months	1 year 6 months	2 years 6 months
EGEN Inc [Member]
Future earn-out payments	$ 30,400,000							$ 24,400,000
Fair value of Acquisition consideration	$ 13,900,000		$ 13,100,000		$ 13,800,000	$ 9,000,000	$ 12,500,000	$ 12,500,000	$ 13,200,000
Gain (loss) from change in fair value of earn out milestone liability		$ 4,114,995		$ 1,246,151		$ 3,567,671	$ 670,172
EGEN Inc [Member] | Minimum [Member]
Risk adjusted assessment of each milestone	10.00%
Estimated time to achieve the milestone	1 year 6 months
EGEN Inc [Member] | Maximum [Member]
Future earn-out payments	$ 30,400,000
Risk adjusted assessment of each milestone	67.00%
Estimated time to achieve the milestone	2 years 6 months

X

- Definition

The amount of estimated time to achieve the milestone.

+ References

No definition available.

+ Details

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X

- Definition

The amount of gain (loss) from the change in the fair value of earn-out milestone liability.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of risk-adjusted assessment of each milestone.

+ References

No definition available.

+ Details

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Namespace Prefix:	CLSN_
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X

- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 25
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 805
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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
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