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Statements of Operations and Comprehensive Income - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Revenue $ 20,035,375 $ 15,027,004 $ 20,035,375 $ 15,027,004
Costs and expenses:        
Research and development expense 7,842,884 5,357,696 13,050,614 9,239,417
General and administrative expense 1,805,724 1,605,092 3,710,687 2,829,995
Total costs and expenses 9,648,608 6,962,788 16,761,301 12,069,412
Income from operations 10,386,767 8,064,216 3,274,074 2,957,592
Other income 2,638 4,263 6,202 9,036
Income and comprehensive income before income taxes 10,389,405 8,068,479 3,280,276 2,966,628
Income tax expense   76,758 0 76,758
Net income and net comprehensive income $ 10,389,405 $ 7,991,721 $ 3,280,276 $ 2,889,870
Basic net income per common share $ 0.55 $ 0.42 $ 0.17 $ 0.16
Diluted net income per common share $ 0.51 $ 0.39 $ 0.16 $ 0.15
Basic weighted average number of common shares 19,011,960 18,807,675 18,986,746 18,020,121
Diluted weighted average number of common shares 20,236,946 20,238,343 20,227,600 19,472,995