Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (2,960,794)	$ (3,801,993)
Adjustments to reconcile net loss to net cash used in operations:
Depreciation	23,313	26,388
Stock-based compensation	165,971	123,209
Bad debt expense		24,000
Non-cash interest expense, debt discount		166,643
Amortization of original issue discount		67,132
Loss on extinguishment of debt		159,202
Change in fair value of derivative liabilities		(82,101)
Loss on disposal of asset	202
Amortization of right-of-use assets	39,059
Other non-cash charges	(3,139)	(3,159)
Changes in operating assets and liabilities:
Accounts receivable	169,642	101,000
Inventories	(86,677)	(169,826)
Prepaid expenses and other current assets	(426,515)	(117,016)
Other assets		57,987
Accounts payable and accrued expenses	952,339	974,991
Operating lease liabilities	21,040
Deferred revenue	(2,512)	1,218
Other liabilities	(4,637)	27,300
Net cash used in operating activities	(2,112,708)	(2,445,025)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of equipment	(44,489)	(7,878)
Net cash used in investing activities	(44,489)	(7,878)
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of debt		(1,703,552)
Payment of prepayment penalty on debt		(255,533)
Proceeds from exercise of warrants	7,288,275	161,298
Proceeds from public offering, net of offering costs		13,504,812
Proceeds from payment of grants		6,928
Net cash provided by financing activities	7,288,275	11,713,953
Effect of foreign exchange rate changes on cash	(1,122)	(23)
Net increase in cash, cash equivalents and restricted cash	5,129,956	9,261,027
Cash, cash equivalents and restricted cash, beginning of period	12,241,261	4,540,455
Cash, cash equivalents and restricted cash, end of period	17,371,217	13,801,482
SUPPLEMENTAL DISCLOSURE CASH FLOW INFORMATION
Cash paid during the period for interest		203,552
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES
Right of use assets obtained in exchange for lease liabilities	654,091
Property and equipment included in accounts payable and in accrued expenses and other liabilities	$ 94,298
Inventory capitalized as sales demo equipment		2,743
Deferred issuance costs to additional paid-in capital paid in prior period		$ 29,277