Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (6,470,196)	$ (8,190,775)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	126,254	124,396
Stock-based compensation	113,635	121,989
Change in fair value of warrant liability	(208,153)	(171,625)
Changes in operating assets and liabilities:
Accounts receivable	(245,786)	413,733
Inventories	(225,089)	41,031
Prepaid expenses and other current and long-term assets	(53,464)	(198,543)
Accounts payable	24,160	(356,769)
Accrued expenses and compensation	295,907	235,924
Deferred revenue	31,037	185,132
Net cash used in operating activities	(6,611,695)	(7,795,507)
Cash flows from investing activities:
Purchases of fixed assets	(37,869)	(55,823)
Net cash used in investing activities	(37,869)	(55,823)
Cash flows from financing activities:
Net proceeds from issuance of stock and warrants	6,312,378	6,719,315
Net cash provided by financing activities	6,312,378	6,719,315
Net decrease in cash and cash equivalents	(337,186)	(1,132,015)
Cash and cash equivalents, beginning of period	3,949,135	12,462,872
Cash and cash equivalents, end of period	3,611,949	11,330,857
Supplemental disclosure of cash flow information:
Change in fair value of warrant liability from repricing	244,611	0
Common stock issued to settle employee incentive compensation obligation	$ 0	$ 318,761