Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net loss	$ (3,949,294)	$ (3,853,116)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	228,538	223,115
Noncash interest expense	4,397	29,265
Noncash interest income	(87,233)
Stock compensation expense	79,740	98,033
Loss on sale of equipment		24,439
Change in fair value of warrant liability		(67)
Impairment of right-of-use asset		520,759
Impairment of intangible assets	750,596
Changes in operating assets and liabilities:
Accounts receivable	401,532	(440,475)
Inventory	36,257	44,545
Other assets	283,180	285,070
Accounts payable	(627)	(31,531)
Accrued compensation and other liabilities	(91,828)	120,015
Deferred revenue		(5,831)
Net cash used in operating activities	(2,344,742)	(2,985,779)
Cash flows from investing activities
Note receivable	(2,200,000)
Purchases of property and equipment	(1,057)	(8,493)
Proceeds from sale of equipment		1,250
Net cash used in investing activities	(2,201,057)	(7,243)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	5,477,432	4,782,509
Proceeds from the exercise of common stock warrants	8,142,000
Payments on debt	(191,772)	(217,484)
Payments on finance lease obligations	(162,453)	(116,538)
Net cash provided by financing activities	13,265,207	4,448,487
Effects of exchange rates on cash	41,824	4,216
Net increase in cash, cash equivalents and restricted cash	8,761,232	1,459,681
Cash, cash equivalents and restricted cash at beginning of period	2,893,603	4,737,207
Cash, cash equivalents and restricted cash at end of period	11,654,835	6,196,888
Supplemental disclosure of cash flow information
Cash paid for interest	55,011	73,754
Supplemental disclosures of noncash investing and financing activities:
Right-of-use assets acquired through finance leases		161,116
Conversion of accounts payable to finance lease		$ 63,600