Statements of Cash Flows (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net loss	$ (7,109,129)us-gaap_NetIncomeLoss	$ (5,101,850)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	44,245us-gaap_Depreciation	34,620us-gaap_Depreciation
Stock-based compensation expense	587,514us-gaap_StockOptionPlanExpense	292,216us-gaap_StockOptionPlanExpense
Changes in assets and liabilities:
Prepaid expenses and other current assets	139,169	1,854,053
Accounts payable	299,464	652,147
Accrued expenses	(2,637,283)	(292,758)
Deferred rent	(29,047)us-gaap_IncreaseDecreaseInPrepaidRent	(25,476)us-gaap_IncreaseDecreaseInPrepaidRent
Net cash used in operating activities	(8,705,067)	(2,587,048)
Investing activities
Purchases of property and equipment	(2,339)	(13,920)
Net cash used in investing activities	(2,339)	(13,920)
Financing activities
Proceeds from issuance of common stock, net of issuance costs		57,256,393
Proceeds from exercise of stock options	75,377
Net cash provided by financing activities	75,377	57,256,393
Net change in cash and cash equivalents	(8,632,029)	54,655,425
Cash and cash equivalents, beginning of period	55,198,923	2,310,603
Cash and cash equivalents, end of period	46,566,894	56,966,028
Supplemental disclosure of non-cash investing activities:
Property asset acquisition included in accounts payable	10,000
Series A-1 Convertible Preferred Stock [Member]
Supplemental disclosure of non-cash financing activities:
Conversion of Series A convertible preferred stock to common stock		$ 38,805,055

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