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Common Stock | 6 Months Ended
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Jun. 30, 2022
Common Stock [Abstract] |
Common Stock | (12) Common Stock Issuance of common stock to investors On January 20, 2021, the Company offered and sold to certain institutional investors an aggregate of 26,181,818 shares of common stock and 26,181,818 warrants to purchase up to 26,181,818 shares of common stock in a best-efforts public offering for gross proceeds of approximately $14.4 million. The purchase price for each share of common stock and the corresponding warrant was $0.55. The exercise price of the warrant was $0.55 per share. On March 1, 2021, the Company offered and sold to the public investors an aggregate of 29,277,866 shares of common stock and 14,638,933 warrants to purchase up to 14,638,933 shares of common stock in a firm commitment underwritten public offering for gross proceeds of approximately $21.9 million. The purchase price for each share of common stock and accompanying warrant was $0.75. The exercise price of the warrant was $0.75 per share,

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