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v3.23.2

Consolidated Statements of Cash Flows - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |  |
Net loss | $ (4,092,384) | $ (4,526,641) | $ (15,591,428) | $ (24,095,727)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
Stock-based compensation expense | 121,371 | 278,131 | 928,052 | 897,260
Amortization of premium and discount on marketable securities | (50,578) | (13,546) | (208,577) | 0
Changes in operating assets and liabilities: |  |  |  |
Prepaid expenses, deposits and other assets | (655,124) | (495,903) | 413,187 | (248,997)
Accounts payable, accrued expenses and other current liabilities | (291,405) | 28,146 | (510,348) | 605,370
Net cash used in operating activities | (4,968,120) | (4,729,813) | (14,969,114) | (14,501,789)
Cash flows from investing activities: |  |  |  |
Purchases of marketable securities | 0 | (22,716,415) | (37,985,738) | 0
Maturities of marketable securities | 9,500,000 | 0 | 25,750,000 | 0
Net cash used in investing activities | 9,500,000 | (22,716,415) | (12,235,738) | 4,000
Cash flows from financing activities: |  |  |  |
Proceeds from the sale of preferred stock | 0 | 5,000 | 5,000 | 0
Net cash provided by financing activities | 0 | 5,000 | 5,000 | 33,295,752
Net (decrease) increase in cash and cash equivalents | 4,531,880 | (27,441,228) | (27,199,852) | 18,797,963
Cash and cash equivalents at beginning of year | 10,113,706 | 37,313,558 | 37,313,558 | 18,515,595
Cash and cash equivalents at end of year | 14,645,586 | 9,872,330 | 10,113,706 | 37,313,558
Supplemental disclosure of non-cash investing and financing activities: |  |  |  |
Unrealized loss on marketable securities | $ 32,252 | $ (49,658) | $ 35,375 | $ 0

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