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Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities    
Net income $ 3,280,276 $ 2,889,870
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Stock-based compensation expense 1,045,744 710,643
Depreciation 90,535 73,472
Loss on disposal of property and equipment   1,424
Changes in assets and liabilities:    
Accounts receivable (20,000,000)  
Prepaid expenses and other current assets 381,398 1,691,358
Accounts payable 222,460 (672,734)
Accrued expenses 161,789 1,983,134
Deferred rent (30,530) (50,713)
Net cash (used in) provided by operating activities (14,848,328) 6,626,454
Investing activities    
Purchases of property and equipment (206,975) (95,737)
Net cash used in investing activities (206,975) (95,737)
Financing activities    
Proceeds from issuance of common stock, net of issuance costs   57,248,219
Proceeds from exercise of stock options 90,537 127,703
Net cash provided by financing activities 90,537 57,375,922
Net change in cash and cash equivalents (14,964,766) 63,906,639
Cash and cash equivalents, beginning of period 55,198,923 2,310,603
Cash and cash equivalents, end of period 40,234,157 66,217,242
Supplemental disclosure of non-cash investing activities:    
Property asset acquisition included in accounts payable $ 10,464  
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