XML 25 R21.htm IDEA: XBRL DOCUMENT
v3.19.3

Warrants | 9 Months Ended
--- | ---
Sep. 30, 2019
Warrants and Rights Note Disclosure [Abstract] |
Warrants | Note 14. Warrants Common Stock Warrants Following is a summary of all warrant activity for the nine months ended September 30, 2019:
Warrants |  | Number of Warrants Issued |  |  | Weighted Average Exercise Price |
Warrants outstanding at December 31, 2018 |  |  | 1,593,162 |  |  | $ | 5.36 |
Warrants issued during the nine months ended September 30, 2019 (see Note 13) |  |  | 200,000 |  |  | $ | 0.01 |
Warrants expired during the nine months ended September 30, 2019 |  |  | (1,167,064 | ) |  | $ | 6.32 |
Warrants outstanding at September 30, 2019 |  |  | 626,098 |  |  | $ | 1.87 |
Aggregate intrinsic value of outstanding warrants at September 30, 2019 |  | $ | 306,000 |  |  |  |  |
Schedule of weighted average remaining contractual terms at September 30, 2019 |  | Number of Warrants Issued |  |  | Weighted Average Exercise Price |  |  | Weighted Average Contractual Terms Remaining
Warrants provided to EGWU, Inc (Note 13) |  |  | 200,000 |  |  | $ | 0.01 |  |  | No expiration
All other warrants outstanding |  |  | 426,098 |  |  | $ | 2.74 |  |  | 5.5 years

X
- Definition Warrants [Text Block] + References No definition available. + Details
Name: | CLSN_WarrantsTextBlock
Namespace Prefix: | CLSN_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_WarrantsAndRightsNoteDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration