Statement of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (9,170,410)	$ (4,468,485)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,415,301	371,171
Warrant remeasurement	0	96,192
Depreciation expense	15,300	9,287
Amortization of debt discount	22,534	26,467
Amortization of debt issuance costs	21,016	0
Non-cash interest expense	8,955	8,364
Changes in assets and liabilities:
Prepaid expenses and other assets	151,571	(62,576)
Accounts payable	842,864	(760,670)
Accrued expenses	(2,381,078)	515,227
Net cash used in operating activities	(9,073,947)	(4,265,023)
Cash flows from investing activities:
Purchases of property and equipment	(77,287)	(86,078)
Net cash used in investing activities	(77,287)	(86,078)
Cash flows from financing activities:
Proceeds from issuance of debt	0	3,000,000
Proceeds from exercise of stock options	546	0
Payments for issuance costs	(549,178)	(50,890)
Payments for debt payable	(547,140)	0
Proceeds from issuance of preferred stock, net of issuance costs	0	(31,314)
Net cash (used in) provided by financing activities	(1,095,772)	2,917,796
Net (decrease) increase in cash	(10,247,006)	(1,433,305)
Cash and cash equivalents at beginning of period	130,189,421	13,728,972
Cash and cash equivalents at end of period	119,942,415	12,295,667
Cash paid for:
Interest	133,047	104,500
Supplemental cash flow information:
Deferred issuance costs included in accrued expenses and accounts payable	0	21,015
Accrued capital expenditures included in accrued expenses	$ 5,000	$ 83,018