Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net loss	$ (7,995,039)	$ (5,865,941)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	663,615	656,192
Amortization of debt (premium) discount	115,645
Depreciation	10,113	2,112
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	201,436	9,066
Other assets	(6,470)	(30,875)
Accounts payable	659,529	(61,941)
Accrued expenses	(285,253)	1,343,778
Net cash used in operating activities	(6,636,424)	(3,947,609)
Cash flows from investing activities
Purchases of equipment	(2,899)	(10,651)
Net cash used in investing activities	(2,899)	(10,651)
Cash flows from financing activities
Procceds from issuance of common stock, net	14,790,021
Proceeds from exercise of options	201,163
Proceeds from exercise of warrants	49,269
Net cash provided by financing activities	15,040,453
Net increase in cash	8,401,130	(3,958,260)
Cash at beginning of period	36,618,497	48,036,260
Cash at end of period	$ 45,019,627	$ 44,078,000