Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities
Net loss	$ (36,555,065)	$ (15,372,379)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	27,116	2,869
Stock-based compensation	17,387,476	871,078
Noncash research and development		10,344,016
Changes in operating assets and liabilities
Prepaid expenses and other current assets	(2,118,809)	(127,541)
Accounts payable	795,034	1,245,758
Other long-term assets	(731,663)
Accrued expenses	866,342	373,613
Net cash used in operating activities	(20,329,569)	(2,662,586)
Cash flows from investing activities
Capital expenditures	(7,503,121)	(24,159)
Net cash used in investing activities	(7,503,121)	(24,159)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	98,169,703
Payments of deferred offering costs	(1,198,220)
Proceeds from exercise of stock options		341,000
Proceeds from exercise of stock warrants	42,000	341,000
Net cash provided by financing activities	97,013,483	8,182,020
Net increase in cash and cash equivalents	69,180,793	5,495,275
Cash and cash equivalents, beginning of period	62,251,860	3,119,713
Cash and cash equivalents, end of period	131,432,653	8,614,988
Supplemental Cash Flow Information
Purchases of property and equipment in accounts payable and accrued liabilities	$ 577,994
Class B Preferred Stock
Cash flows from financing activities
Proceeds from issuance of preferred stock		2,500,000
Class C Preferred Stock
Cash flows from financing activities
Proceeds from issuance of preferred stock		$ 5,000,020