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Net Income (Loss) Per Share Attributable to Common Shareholders (Details) - Schedule of securities excluded from computation of diluted net income (loss) per share - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Schedule of securities excluded from computation of diluted net income (loss) per share [Abstract] |  |  |  |
Series D redeemable convertible preferred stock |  | 9,394,057 |  | 9,394,057
Series C redeemable convertible preferred stock |  | 7,264,519 |  | 7,264,519
Series B redeemable convertible preferred stock |  | 4,168,815 |  | 4,168,815
Series A redeemable convertible preferred stock |  | 16,066,503 |  | 16,066,503
Series D redeemable convertible preferred stock warrants |  | 320,441 |  | 320,441
Series A redeemable convertible preferred stock warrants |  | 1,608,670 |  | 1,608,670
Convertible notes payable (see Note 11) |  |  | 482,703 |
Common stock warrants (see Note 10) | 2,523,351 |  | 4,569,962 |
Options to purchase common stock | 2,685,575 | 7,509,810 | 9,063,423 | 7,509,810
Restricted stock awards | 1,100,050 |  | 1,245,489 |
Chardan Unit Purchase Option Warrants (see Notes 3 and 10) | 24,583 |  | 24,583 |
Clene Nanomedicine contingent earn-out shares (see Note 3 and 12) | 8,346,185 |  | 8,346,185 |
Initial Shareholders contingent earn-out shares (see Note 3 and 12) | 750,000 |  | 750,000 |
Total | 15,429,744 | 46,332,815 | 24,482,345 | 46,332,815

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