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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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