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Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating activities    
Net loss $ (15,626,548) $ 3,280,276
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 93,941 90,535
Stock-based compensation expense 1,499,233 1,045,744
Changes in assets and liabilities    
Increase (Decrease) in Accounts Receivable   (20,000,000)
Prepaid expenses and other current assets (1,007,209) 381,398
Deposits (52,320)  
Accounts payable 816,924 222,460
Accrued expenses (2,665,895) 161,789
Deferred rent 637,229 (30,530)
Net cash used in operating activities (16,304,645) (14,848,328)
Investing activities    
Purchases of property and equipment (40,250) (206,975)
Net cash used in investing activities (40,250) (206,975)
Financing activities    
Proceeds from issuance of common stock, net of issuance costs 22,589,562  
Proceeds from exercise of stock options 37,963 90,537
Net cash provided by financing activities 22,627,525 90,537
Net change in cash and cash equivalents 6,282,630 (14,964,766)
Cash and cash equivalents, beginning of period 46,802,560 55,198,923
Cash and cash equivalents, end of period 53,085,190 40,234,157
Supplemental disclosure of non-cash investing activities:    
Property asset acquisition included in accounts payable 20,297 $ 10,464
Supplemental disclosure of non-cash financing activities:    
Issuance costs associated with the at-the-market financing included in accounts payable and accrued expenses $ 95,027