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Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating activities    
Net income (loss) $ 2,889,870 $ (3,037,371)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation 73,472 64,319
Loss on disposal of property and equipment 1,424 0
Compensation expense from stock option grants 710,643 217,674
Changes in assets and liabilities:    
Prepaid expenses and other current assets 1,691,358 237,551
Accounts payable (672,734) (215,635)
Accrued expenses 1,983,134 56,320
Deferred revenue 0 (3,862,665)
Deferred rent (50,713) (44,301)
Net cash provided by (used in) operating activities 6,626,454 (6,584,108)
Investing activities    
Purchases of property and equipment (95,737) (30,492)
Net cash used in investing activities (95,737) (30,492)
Financing activities    
Proceeds from issuance of common stock, net of issuance costs 57,248,219 0
Proceeds from exercise of stock options and warrants 127,703 19,750
Net cash provided by financing activities 57,375,922 19,750
Net change in cash and cash equivalents 63,906,639 (6,594,850)
Cash and cash equivalents, beginning of period 2,310,603 17,372,832
Cash and cash equivalents, end of period 66,217,242 10,777,982
Series A-1 Convertible Preferred Stock [Member]
    
Supplemental schedule of noncash financing activities:    
Conversion of Series A-1 Convertible Preferred Stock to Common Stock $ 38,805,055 $ 0