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Stockholders' Equity (Tables)
 12 Months Ended
Jun. 30, 2015
Class of Stock [Line Items]  
Gross proceeds received in connection with offerings

 

Par value of common stock issued $3,433 
Additional paid-in-capital  17,892,725 
Derivative warrant liabilities  3,337,025 
Derivative warrants issued to placement agent as offering costs  996,138 
Net proceeds  22,229,321 
Offering costs paid in cash  3,516,378 
Gross proceeds $25,745,699 
Summary of changes in options outstanding

 

  Number of Shares  Weighted Average Exercise Price Per Share  Weighted Average Remaining Contractual Term (Years)  Aggregate Intrinsic Value 
Outstanding and expected to vest at December 31, 2012  135,592  $4.00   9.5  $- 
Granted  237,490  $4.00         
Outstanding and expected to vest at December 31, 2013  373,082  $4.00   8.8  $1,305,000 
Granted  299,952  $7.50         
Outstanding and expected to vest at June 30, 2014  673,034  $5.56   9.2  $2,988,000 
Granted  311,100  $12.63         
Forfeited  (206,504) $9.12         
Outstanding and expected to vest at June 30, 2015  777,630  $7.44   8.6  $2,787,000 
Options exercisable at June 30, 2015  301,499  $5.03   8.0  $1,557,000 

 
Weighted average fair value of options granted
  Year Ended June 30,
2015		  

Six Months
Ended
June 30,
2014

  Year Ended December 31,
2013		 
          
Risk free interest rate  1.5% to 1.8%    1.5 to 1.6%  0.6%
Dividend yield  0%  0%  0%
Volatility  71% to 76%  76% to 77%    73% to 80%
Expected term (in years)  6.25   6.25   5.75 to 10 
Schedule of share based compensation expense

 

  Year Ended June 30,
2015		  Six Months Ended 
June 30,
2014		  Year Ended December 31, 2014 
Research and development $321,900  $115,500  $11,800 
General and administrative  475,100   10,203,600   370,500 
Total $797,000  $10,319,100  $382,300 
Summary of changes in warrants outstanding
  Number of Shares  Weighted Average Exercise Price Per Share 
Outstanding at December 31, 2012  973,046  $2.41 
Granted  812,257   2.49 
Outstanding at December 31, 2013  1,785,303  $2.41 
Granted  7,017,251  $7.35 
Forfeited  (173,643) $4.00 
Outstanding and vested at June 30, 2014  8,628,911  $6.40 
Granted  173,643  $4.00 
Exercised  (2,040,277) $7.50 
Forfeited  (1,400,094) $7.50 
Outstanding and vested at June 30, 2015  5,362,183  $5.60
Weighted average fair value of warrants granted
  Year Ended 
June 30,
2015		  Six Months 
Ended 
June 30,
2014		  Year Ended
June 30,
2013		 
Risk-free interest rate  N/A    0.7% to 2.0%   0.9% to 1.8%
Dividend yield  N/A   0%  0%
Expected volatility  N/A   75% to 76%   73% to 83%
Expected term (in years)  N/A   4 and 7   4-7
Series A Preferred Stock [Member]  
Class of Stock [Line Items]  
Gross proceeds received in connection with offerings

 

Par value of Series A preferred stock issued $1,020 
Additional paid-in-capital  1,483,690 
Derivative warrant liabilities  113,153 
Derivative preferred stock conversion feature  1,647,910 
Derivative warrants issued to placement agent as offering costs  248,655 
Offering costs paid in cash  586,072 
Total $4,080,500