Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net loss	$ (6,380,297)	$ (9,185,979)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	317,652	324,412
Noncash interest expense	94,594	19,498
Share-based compensation	452,080	454,712
Gain on sale of equipment	(5,253)	0
Change in fair value of warrant liabilities	(8,155)	(26,744)
Changes in operating assets and liabilities:
Accounts receivable	291,273	130,658
Inventory	(81,321)	113,465
Other assets	(235,835)	81,926
Accounts payable	(219,565)	674,627
Accrued compensation and other liabilities	226,611	(248,372)
Deferred revenue	(10,320)	363
Net cash used in operating activities	(5,558,536)	(7,661,434)
Cash flows from investing activities
Purchases of property and equipment	(4,457)	(174,113)
Proceeds from sale of equipment	10,440	0
Net cash provided by (used in) investing activities	5,983	(174,113)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	192,322	3,426,050
Proceeds from issuance of units, net of selling costs	10,728,132	0
Proceeds from debt, net of issuance costs	309,900	664,461
Proceeds from exercise of stock options	0	7,560
Payments on debt	(55,582)	(53,047)
Payments on capital lease obligations	(107,871)	(108,095)
Net cash provided by financing activities	11,066,901	3,936,929
Effects of exchange rates on cash	5,584	(7,023)
Net increase (decrease) in cash, cash equivalents and restricted cash	5,519,932	(3,905,641)
Cash, cash equivalents and restricted cash at beginning of period	2,090,551	4,360,704
Cash, cash equivalents and restricted cash at end of period	7,610,483	455,063
Supplemental disclosure of cash flow information
Cash paid for interest	17,785	36,131
Supplemental disclosures of noncash investing and financing activities:
Property and equipment acquired through capital lease	281,153	0
Conversion of accounts payable to capital lease	174,968	0
Unpaid deferred offering costs	$ 0	$ 179,150

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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