Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (36,956,181)	$ (29,305,801)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	4,637,142	4,029,326
Stock-based 401K company common match	170,620	0
Depreciation expense	134,569	60,331
Loss on disposal of fixed assets	0	102,789
Amortization of debt discount	28,871	60,206
Amortization of debt issuance costs	81,306	63,699
Non-cash interest expense	274,530	82,357
Changes in assets and liabilities:
Prepaid expenses and other assets	627,848	633,513
Accounts payable	(524,145)	(399,708)
Accrued expenses	68,683	(1,469,109)
Net cash used in operating activities	(31,456,757)	(26,142,397)
Cash flows from investing activities:
Purchases of property and equipment	(160,751)	(339,410)
Net cash used in investing activities	(160,751)	(339,410)
Cash flows from financing activities:
Proceeds from issuance of debt	5,000,000	11,022,286
Proceeds from exercise of stock options	91,982	293,988
Proceeds from exercise of warrants	50,922	13,107
Payments for issuance costs	0	(544,773)
Payments for debt issuance costs	0	(219,042)
Repayment of debt	0	(1,488,558)
Proceeds from issuance of common stock, net of issuance costs	17,382,943	0
Net cash provided by (used in) financing activities	22,525,847	9,077,008
Net increase (decrease) in cash	(9,091,661)	(17,404,799)
Cash and cash equivalents at beginning of period	106,398,919	130,189,421
Cash and cash equivalents at end of period	97,307,258	112,784,622
Cash paid for:
Interest	1,172,979	443,464
Supplemental cash flow information:
Accrued capital expenditures included in accrued expenses and accounts payable	$ 18,084	$ 348,591