Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Cash flows from operating activities
Net loss			$ (9,928,565)	$ (9,635,722)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization			687,107	508,162
Noncash interest expense			2,659	108,011
Stock compensation expense			275,171	658,731
Loss (gain) on sale of equipment			9,904	(5,253)
Change in fair value of warrant liability			(67)	(8,070)
Impairment of right-of-use asset	$ 0	$ 0	520,759	0
Changes in operating assets and liabilities:
Accounts receivable			(5,173)	492,444
Inventory			74,449	3,179
Other assets			55,122	(164,346)
Accounts payable			314,559	(493,971)
Accrued compensation and other liabilities			(55,871)	174,560
Deferred revenue			(6,016)	(14,119)
Net cash used in operating activities			(8,055,962)	(8,376,394)
Cash flows from investing activities
Purchases of property and equipment			(72,607)	(41,910)
Proceeds from sale of equipment			29,250	10,440
Net cash used in investing activities			(43,357)	(31,470)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs			4,782,509	597,743
Proceeds from issuance of units, net of selling costs			0	10,728,132
Proceeds from debt, net of issuance costs			470,519	381,253
Payments on debt			(694,156)	(299,256)
Payments on finance leases			(389,501)	(177,092)
Net cash provided by financing activities			4,169,371	11,230,780
Effects of exchange rates on cash			4,541	7,419
Net (decrease) increase in cash, cash equivalents and restricted cash			(3,925,407)	2,830,335
Cash, cash equivalents and restricted cash at beginning of period			4,737,207	2,090,551	$ 2,090,551
Cash, cash equivalents and restricted cash at end of period	$ 811,800	$ 4,920,886	811,800	4,920,886	$ 4,737,207
Supplemental disclosure of cash flow information
Cash paid for interest			170,608	32,442
Supplemental disclosures of noncash investing and financing activities:
Right-of-use assets acquired through finance leases			528,413	585,278
Shares issued to settle obligations			0	272,610
Conversion of accounts payable to finance lease			$ 63,600	$ 156,775