v3.20.1

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (5,557,567)	$ (5,167,884)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	676,614	809,331
Amortization of debt discount		114,548
Non-cash interest expense		187,500
Depreciation	17,677	20,093
Changes in operating assets and liabilities:
Increase in trade receivables	(7,296)	(23,983)
Decrease in inventory	47,158	8,917
(Increase) decrease in prepaid expenses and other current assets	(3,121,838)	114,891
Increase (decrease) in accounts payable	309,025	(1,126,565)
Decrease in accrued expenses	(328,493)	(2,302,112)
Decrease in deferred revenue	(2,206)	(2,206)
Net cash used in operating activities	(7,966,926)	(7,367,470)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of short-term investments	(3,799,033)	(7,966,821)
Maturity of short-term investments	4,794,369	21,263
Purchase of equipment	(9,918)	(19,219)
Net cash provided by (used in) investing activities	985,418	(7,964,777)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from sale of common stock from at-the-market program, net	2,469,937	15,234,529
Proceeds from exercise of warrants	411,751	620,280
Payments of financing fees	(47,024)
Proceeds from exercise of stock options		112,766
Net cash provided by financing activities	2,834,664	15,967,575
Foreign exchange effect on cash	(2,181)	(2,099)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(4,149,025)	633,229
CASH, CASH EQUIVALENTS AND RESTRICTED CASH – BEGINNING OF PERIOD	16,525,187	17,795,323
CASH, CASH EQUIVALENTS AND RESTRICTED CASH – END OF PERIOD	12,376,162	18,428,552
Cash paid for interest	6,276
Supplemental Disclosure of Non-Cash Financing Activities:
Conversion of preferred stock to common stock		50
Unrealized loss from investments	5,633	1,008
Issuance of common stock for vested restricted stock units	$ 2	$ 7

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