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Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating activities    
Net loss $ (3,887,795) $ (3,727,707)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation 142,417 114,261
Loss on disposal of property and equipment 8,001 1,424
Stock based compensation expense 1,678,668 1,152,420
Changes in assets and liabilities:    
Prepaid expenses and other current assets 198,015 1,985,251
Accounts payable (240,935) (561,176)
Accrued expenses 727,701 2,984,607
Deferred rent 89,514 (76,188)
Net cash (used in) provided by operating activities (1,284,414) 1,872,892
Investing activities    
Purchases of property and equipment (265,367) (197,738)
Net cash used in investing activities (265,367) (197,738)
Financing activities    
Proceeds from issuance of common stock, net of issuance costs   57,248,219
Proceeds from exercise of stock options and warrants 110,697 128,127
Net cash provided by financing activities 110,697 57,376,346
Net change in cash and cash equivalents (1,439,084) 59,051,500
Cash and cash equivalents, beginning of period 55,198,923 2,310,603
Cash and cash equivalents, end of period $ 53,759,839 61,362,103
Series A-1 Convertible Preferred Stock [Member]    
Supplemental schedule of noncash financing activities    
Conversion of Series A convertible preferred stock to common stock   $ 38,805,055