XML 62 R52.htm IDEA: XBRL DOCUMENT
v3.19.2

Earn-out Milestone Liability (Details Narrative) - USD ($) |  | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 20, 2014 | Jun. 20, 2014 | Mar. 03, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 28, 2019
Fair value of Acquisition consideration |  |  |  |  |  |  |  |  | $ 4,500,000 | $ 2,500,000 |
Warrants exercise price |  |  |  |  |  |  | $ 0.01 |  |  |  |
Gain (loss) from change in fair value of earn out milestone liability |  |  |  |  |  |  | $ 3,002,939 |  |  |  |
EGEN Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Future earn-out payments | $ 30,400,000 | $ 30,400,000 |  |  |  |  |  |  |  |  |
Fair value of Acquisition consideration |  | $ 13,900,000 |  |  |  | $ 12,800,000 |  | $ 13,100,000 |  | $ 12,500,000 |
Warrants to purchase common stock |  |  |  |  | 200,000 |  |  | 200,000 |  |  |
Warrants strike price |  |  |  |  | $ 0.01 |  |  | $ 0.01 |  |  |
Warrants exercise price |  |  |  |  | $ 2.00 |  |  | $ 2.00 |  |  |
Non-cash benefit |  |  |  |  |  |  | 3,000,000 |  |  |  |
EGEN Inc [Member] | Amended Asset Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Earnout milestone liability |  |  |  |  |  |  |  |  |  |  | $ 12,400,000
EGEN Inc [Member] | Amended Asset Purchase Agreement [Member] | 10 Business Days of Achieving Milestone [Member] |  |  |  |  |  |  |  |  |  |  |
Earnout milestone liability |  |  |  |  |  |  |  |  |  |  | 7,000,000
EGEN Inc [Member] | Amended Asset Purchase Agreement [Member] | Within One Year of Achieving Milestone [Member] |  |  |  |  |  |  |  |  |  |  |
Earnout milestone liability |  |  |  |  |  |  |  |  |  |  | $ 12,400,000
EGEN Inc [Member] | Fair Value Earnout Milestone Liability [Member] |  |  |  |  |  |  |  |  |  |  |
Fair value of Acquisition consideration |  |  |  | $ 5,800,000 |  |  | $ 5,900,000 |  | $ 8,900,000 |  |
EGEN Inc [Member] | Amended Asset Purchase Agreement Option Payment 1 [Member] |  |  |  |  |  |  |  |  |  |  |
Risk adjusted assessment of each milestone |  |  |  | 80.00% |  |  |  |  |  |  |
Gain (loss) from change in fair value of earn out milestone liability |  |  |  | $ 7,000,000 |  |  |  |  |  |  |
EGEN Inc [Member] | Amended Asset Purchase Agreement Option Payment 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Risk adjusted assessment of each milestone |  |  |  |  |  |  | 20.00% |  |  |  |
Gain (loss) from change in fair value of earn out milestone liability |  |  | $ 12,400,000 |  |  |  |  |  |  |  |
EGEN Inc [Member] | Recognized Non-cash Charge [Member] |  |  |  |  |  |  |  |  |  |  |
Fair value of Acquisition consideration |  |  |  |  | $ 270,195 |  |  | $ 547,324 |  |  |
EGEN Inc [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Risk adjusted assessment of each milestone | 10.00% | 10.00% |  |  |  |  |  |  |  |  |
Estimated time to achieve the milestone |  | 1 year 6 months |  |  |  |  |  |  |  |  |
EGEN Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Future earn-out payments | $ 30,400,000 | $ 30,400,000 |  |  |  |  |  |  |  |  |
Risk adjusted assessment of each milestone | 67.00% | 67.00% |  |  |  |  |  |  |  |  |
Estimated time to achieve the milestone | 2 years 6 months |  |  |  |  |  |  |  |  |  |

X
- Definition Earnout milestone liability. + References No definition available. + Details
Name: | CLSN_EarnoutMilestoneLiability1
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of estimated time to achieve the milestone. + References No definition available. + Details
Name: | CLSN_EstimatedTimeToAchieveTheMilestone
Namespace Prefix: | CLSN_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of gain (loss) from the change in the fair value of earn-out milestone liability. + References No definition available. + Details
Name: | CLSN_GainLossFromChangeInFairValueOfEarnOutMilestoneLiability
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Non-cash benefit. + References No definition available. + Details
Name: | CLSN_NoncashBenefit
Namespace Prefix: | CLSN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of risk-adjusted assessment of each milestone. + References No definition available. + Details
Name: | CLSN_RiskAdjustedAssessmentOfEachMilestone
Namespace Prefix: | CLSN_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Warrants strike price. + References No definition available. + Details
Name: | CLSN_WarrantsStrikePrice
Namespace Prefix: | CLSN_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=CLSN_EGENIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=CLSN_AmendedAssetPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=CLSN_CertainBusinessDaysOfAchievingMilestoneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=CLSN_AchievingMilestoneWithInOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=CLSN_FairValueEarnoutMilestoneLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=CLSN_AmendedAssetPurchaseAgreementOptionPaymentOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=CLSN_AmendedAssetPurchaseAgreementOptionPaymentTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=CLSN_RecognizedNonCashChargeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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