Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net loss	$ (6,478,212)	$ (4,857,021)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	160,993	103,250
Stock-based compensation	246,406	208,358
Warrant offering cost	0	50,874
Change in fair value of warrant liability	(3,473,804)	(1,554,411)
Changes in operating assets and liabilities:
Accounts receivable	(321,655)	(220,868)
Inventories	(392,422)	(67,200)
Prepaid expenses and other current and long-term assets	(484,063)	(26,476)
Accounts payable	423,275	199,818
Accrued expenses and compensation	30,948	841,317
Deferred revenue	667,994	(32,570)
Net cash used in operating activities	(9,620,540)	(5,354,929)
Cash flows from investing activities:
Purchases of fixed assets	(594,606)	(71,982)
Net cash used in investing activities	(594,606)	(71,982)
Cash flows from financing activities:
Net proceeds from issuance of stock and warrants	13,316,324	7,918,179
Repurchase of Series A-4 preferred stock and warrants	(3,206,357)	0
Net cash provided by financing activities	10,109,967	7,918,179
Net (decrease) increase in cash and cash equivalents	(105,179)	2,491,268
Cash and cash equivalents, beginning of period	9,221,985	9,195,753
Cash and cash equivalents, end of period	9,116,806	11,687,021
Supplemental disclosure of cash flow information:
Common stock issued to settle employee incentive compensation obligation	281,757	104,405
Warrants issued under Securities Purchase Agreement recorded as a non-current liability	$ 0	$ 4,418,824