XML 49 R36.htm IDEA: XBRL DOCUMENT
v3.19.1

Warrants (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Notes To Financial Statements [Abstract] |
Summary of Warrant Activity | Following is a summary of all warrant activity for the two years ended December 31, 2018:
Warrants |  | Number of Warrants Issued |  |  | Weighted Average Exercise Price |
Warrants outstanding at January 1, 2017 |  |  | 1,487,958 |  |  | $ | 9.39 |
Warrants issued in connection with 2017 equity transactions |  |  | 9,231,628 |  |  | $ | 3.46 |
Warrants exercised during 2017 |  |  | (7,617,147 | ) |  | $ | 2.89 |
Warrants expired during 2017 |  |  | (44,037 | ) |  | $ | 209.23 |
Warrants outstanding at December 31, 2017 |  |  | 3,058,402 |  |  | $ | 5.29 |
Warrants issued in connection with 2018 debt transaction |  |  | 190,114 |  |  | $ | 2.63 |
Warrants cancelled in exchange for common stock |  |  | (1,641,427 | ) |  | $ | 3.04 |
Warrants expired during 2018 |  |  | (13,927 | ) |  | $ | 226.24 |
Warrants outstanding and exercisable at December 31, 2018 |  |  | 1,593,162 |  |  | $ | 5.36 |
Aggregate intrinsic value of outstanding warrants at December 31, 2018 |  | $ | - |  |  |  |  |
Weighted average remaining contractual terms (years) |  |  | 1.87 |  |  |  |  |

X
- Definition Tabular disclosure of warrant activity. + References No definition available. + Details
Name: | CLSN_ScheduleOfWarrantActivityTableTextBlock
Namespace Prefix: | CLSN_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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