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v3.20.1

Earn-out Milestone Liability - Schedule of Risk Adjustment Assessment (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Risk-adjustment Assessment of achieving each Milestone | 80.00% | 80.00% | 80.00% | 80.00%
Discount Rate | 9.00% | 9.00% | 9.00% | 9.00%
Estimated Time to Achieve |  |  |  | 1 year 2 months 30 days
Minimum [Member] |  |  |  |
Estimated Time to Achieve | 1 year 15 days | 1 year | 1 year 1 month 13 days |
Maximum [Member] |  |  |  |
Estimated Time to Achieve | 2 years 15 days | 2 years | 2 years 1 month 13 days |

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- Definition Discount rate on milestone liabilites. + References No definition available. + Details
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Namespace Prefix: | CLSN_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Estimated time to achieve milestone liability. + References No definition available. + Details
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Namespace Prefix: | CLSN_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Risk-adjustment assessment of achieving each milestone. + References No definition available. + Details
Name: | CLSN_RiskadjustmentAssessmentOfAchievingEachMilestone
Namespace Prefix: | CLSN_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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