Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net loss	$ (10,748,531)	$ (12,121,463)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,706,524	1,504,356
Non-cash interest	120,889	55,883
Deferred rent expense		(12,313)
Financing costs allocated to warrant liability	533,692
Change in fair value of warrant liability	(597,615)
Change in operating assets and liabilities:
Prepaid expenses and other assets	554,014	98,185
Accounts payable and accrued expenses	(276,715)	(20,486)
Net cash used in operating activities	(8,707,742)	(10,495,838)
Financing activities
Payment on bank loan	(4,500,000)
Proceeds from issuance of common stock, net	354,855	5,031,184
Proceeds from issuance of common stock and warrants, net	13,168,803
Net cash provided by financing activities	9,023,658	5,031,184
Net increase (decrease) in cash and cash equivalents	315,916	(5,464,654)
Cash and cash equivalents at beginning of period	8,691,155	14,155,809
Cash and cash equivalents at end of period	9,007,071	8,691,155
Supplemental disclosure of cash flow information
Interest paid	169,813	230,313
Non-cash financing activities
Deferred financing costs paid in prior year		$ 137,812
Fair value of warrants issued to placement agent	$ 369,863