Statement of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (18,546,539)	$ (9,989,448)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	2,796,296	954,684
Warrant remeasurement	0	446,321
Depreciation expense	31,689	23,714
Amortization of debt discount	42,623	52,933
Amortization of debt issuance costs	39,847	0
Non-cash interest expense	16,982	18,516
Changes in assets and liabilities:
Prepaid expenses and other assets	262,600	61,923
Accounts payable	289,820	(1,202,721)
Accrued expenses	(2,282,473)	(336,896)
Net cash used in operating activities	(17,349,155)	(9,970,974)
Cash flows from investing activities:
Purchases of property and equipment	(195,317)	(447,170)
Net cash used in investing activities	(195,317)	(447,170)
Cash flows from financing activities:
Proceeds from issuance of debt	0	3,000,000
Proceeds from exercise of stock options	26,199	0
Proceeds from exercise of warrants	2,621	0
Payments for issuance costs	(544,773)	(240,316)
Payments for debt payable	(1,106,962)	0
Proceeds from issuance of preferred stock, net of issuance costs	0	52,394,571
Net cash (used in) provided by financing activities	(1,622,915)	55,154,255
Net (decrease) increase in cash	(19,167,387)	44,736,111
Cash and cash equivalents at beginning of period	130,189,421	13,728,972
Cash and cash equivalents at end of period	111,022,034	58,465,083
Cash paid for:
Interest	253,412	264,733
Supplemental cash flow information:
Deferred issuance costs included in accrued expenses and accounts payable	0	33,826
Accrued capital expenditures included in accrued expenses and accounts payable	$ 530,500	$ 266,967