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v3.21.1

Statements of Cash Flows - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Operating activities |  |
Net loss | $ (14,274,059) | $ (7,662,604)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation | 68,088 | 68,191
Loss on disposal of assets | 2,174 |
Non-cash lease expense | 180,586 | 164,262
Stock-based compensation expense | 1,614,185 | 1,822,148
Changes in assets and liabilities: |  |
Prepaid expenses and other current assets | 85 | 2,267,641
Accounts payable | 50,861 | 1,698,622
Accrued expenses | (1,661,963) | (2,059,678)
Noncurrent accrued expenses | 109,582 | 393,273
Operating lease liabilities | (214,810) | (191,994)
Net cash used in operating activities | (14,125,271) | (3,500,139)
Investing activities |  |
Purchases of property and equipment | (3,060) | (8,136)
Net cash used in investing activities | (3,060) | (8,136)
Financing activities |  |
Proceeds from issuance of common stock, net of issuance costs | 9,559,699 |
Proceeds from exercise of stock options | 4,239 | 129,972
Net cash provided by financing activities | 9,563,938 | 129,972
Net change in cash and cash equivalents | (4,564,393) | (3,378,303)
Cash and cash equivalents, beginning of period | 137,035,017 | 158,201,441
Cash and cash equivalents, end of period | $ 132,470,624 | $ 154,823,138

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