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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (15,094,172) | $ (14,092,912)
Adjustments to reconcile net loss to cash used in operating activities: |  |
Depreciation and amortization | 141,453 | 132,798
Stock-based compensation | 467,541 | 866,791
Gain on extinguishment of debt | (185,280) |
Noncash lease expense | 66,476 | 56,562
Gain on revaluation of derivative warrants |  | (43,000)
Changes in: |  |
Prepaid expenses and other current assets | (3,480) | (129,733)
Other assets |  | 477,695
Accounts payable and accrued liabilities | 780,604 | 1,120,054
Lease liability | (105,885) | (81,963)
Cash used in operating activities | (13,932,743) | (11,693,708)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of fixed assets | (62,353) | (24,542)
Cash used in investing activities | (62,353) | (24,542)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Payments on capital lease obligations |  | (2,213)
Proceeds from long-term obligations | 184,000 |
Proceeds from issuance of common stock and preferred stock, net of underwriting issuance costs | 59,719,256 | 9,024,569
Proceeds from exercise of warrants | 642,495 |
Cash provided by financing activities | 60,545,751 | 9,022,356
INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | 46,550,655 | (2,695,894)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD | 10,614,722 | 13,310,616
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD | 57,165,377 | 10,614,722
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION |  |
Cash paid for interest expense | 1,584 | 880
Gain on extinguishment of debt | $ 185,280 |
Conversion of preferred stock to common stock |  | $ 1,377,845

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