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v3.21.2

Consolidated Statements of Cash Flows (Unaudited) - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Cash flows from operating activities |  |
Net loss | $ (8,856,391) | $ (7,365,060)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Stock-based compensation expense | 1,324,400 | 1,264,233
Amortization of held-to-maturity securities, net | 254,193 | 282,123
Gain on investment in BDI | (1,605,532) | 0
Foreign currency exchange loss (gain), net | 76,081 | 26,317
Changes in operating assets and liabilities: |  |
Interest receivable | 37,454 | 223,306
Accounts receivable | 72,051 | (141,698)
Income tax receivable | 0 | 500,616
Prepaid expenses and other current assets | (289,481) | (141,550)
Accounts payable | (47,033) | (61,651)
Accrued expenses | 352,713 | 50,745
Deferred research and development obligation | 39,664 | 75,211
Net cash used in operating activities | (8,641,881) | (5,287,408)
Cash flows from investing activities |  |
Purchases of held-to-maturity investment securities | (11,283,940) | (14,677,156)
Proceeds from maturities of investment securities | 10,400,000 | 36,761,000
Proceeds from the sale of BDI equity interest | 1,605,532 | 0
Net cash provided by investing activities | 721,592 | 22,083,844
Cash flows from financing activities |  |
Proceeds from exercise of options | 985,550 | 230,810
Net cash provided by financing activities | 985,550 | 230,810
Effect of exchange rate changes on cash | (41,695) | 11,791
Net (decrease) increase in cash and cash equivalents | (6,976,434) | 17,039,037
Cash and cash equivalents at beginning of period | 20,637,045 | 4,823,544
Cash and cash equivalents at end of period | 13,660,611 | 21,862,581
Supplemental cash flow information |  |
Cash received from income tax refund | $ 0 | $ 505,616

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