Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (9,979,179)	$ (12,098,928)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	198,892	189,224
Stock-based compensation	170,093	176,684
Change in fair value of warrant liability	(208,480)	(227,873)
Changes in operating assets and liabilities:
Accounts receivable	315,285	236,447
Inventories	(533,836)	(73,072)
Prepaid expenses and other current and long-term assets	(365,547)	(408,532)
Accounts payable	(22,074)	(287,427)
Accrued expenses and compensation	647,797	634,181
Deferred revenue	297,558	402,178
Net cash used in operating activities	(9,479,491)	(11,457,118)
Cash flows from investing activities:
Purchases of fixed assets	(70,226)	(87,884)
Net cash used in investing activities	(70,226)	(87,884)
Cash flows from financing activities:
Net proceeds from issuance of stock and warrants	9,569,800	6,650,316
Net cash provided by financing activities	9,569,800	6,650,316
Net increase/(decrease) in cash and cash equivalents	20,083	(4,894,686)
Cash and cash equivalents, beginning of period	3,949,135	12,462,872
Cash and cash equivalents, end of period	3,969,218	7,568,186
Supplemental disclosure of cash flow information:
Change in fair value of warrant liability from repricing	244,611	0
Exchange of warrant liability for Series F Preferred Stock	(40,772)	0
Common stock issued to settle employee incentive compensation obligation	$ 0	$ 318,761