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v3.21.2

Nature of the Business (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 21, 2021 | Feb. 16, 2021 | Jul. 22, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Nature of the Business [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in Shares) |  |  |  | 4,815,000 |  | 4,815,000 |  |
Aggregate proceeds if warrants exercised |  | $ 30,700,000 | $ 3,000,000 |  |  |  |  |
Offering Cost |  |  |  | $ 0 |  | $ 27,000 |  |
Aggregate proceeds received |  |  |  | 10,000 |  | $ 10,000 |  |
Offering price per share (in Dollars per share) |  |  |  |  |  | $ 0.01 |  |
Warrants outstanding (in Shares) |  |  | 1,140,731 |  |  |  |  |
Common stock underlying warrant outstanding (in Shares) | 115,851 |  | 1,024,880 |  |  |  |  |
Net income loss |  |  |  | 28,944,000 | $ (10,295,000) | $ (14,163,000) | $ (20,055,000) |
Cash |  |  |  | 60,552,000 | $ 36,781,000 | 60,552,000 | 36,781,000 | $ 59,275,000
Accumulated deficit |  |  |  | $ (167,724,000) |  | (167,724,000) |  | $ (153,561,000)
Net cash (used in) operating activities |  |  |  |  |  | $ (25,018,000) | $ (13,121,000) |
Tottenham [Member] |  |  |  |  |  |  |  |
Nature of the Business [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in Shares) |  | 2,517,500 |  |  |  |  |  |
Clene Nanomedicine [Member] |  |  |  |  |  |  |  |
Nature of the Business [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in Shares) |  | 904,231 |  |  |  |  |  |
PIPE [Member] |  |  |  |  |  |  |  |
Nature of the Business [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in Shares) |  |  |  |  |  |  |  | 2,239,500
Warrant [Member] | Clene Inc [Member] |  |  |  |  |  |  |  |
Nature of the Business [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in Shares) |  | 4,541,481 |  |  |  |  |  |
Warrant [Member] | PIPE [Member] |  |  |  |  |  |  |  |
Nature of the Business [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in Shares) |  |  |  |  |  |  |  | 2,004,500
Private Placement [Member] |  |  |  |  |  |  |  |
Nature of the Business [Line Items] |  |  |  |  |  |  |  |
Common Stock, issued in a private placement (in Shares) | 960,540 |  |  |  |  |  |  |

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