Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - 2016 Equity Incentive Plan (Details)

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Stock Based Compensation - 2016 Equity Incentive Plan (Details)
 3 Months Ended 6 Months Ended
May 18, 2016
item
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Total stock-based compensation | $   $ 214,113 $ 242,026 $ 1,151,420 $ 292,213
Option Activity, Number of shares          
Balance, beginning of period       959,188  
Granted       560,950  
Balance, end of period   1,520,138   1,520,138  
Vested or expected to vest   1,520,138   1,520,138  
Exercisable   642,541   642,541  
Option Activity, Weighted-average exercise price          
Beginning of period | $ / shares       $ 7.68  
Granted | $ / shares       3.27  
End of period | $ / shares   $ 6.05   6.05  
Vested or expected to vest | $ / shares   6.05   6.05  
Exercisable | $ / shares   $ 8.27   $ 8.27  
Option Activity, Fair value of options granted          
Granted | $   $ 1,275,371   $ 1,275,371  
Option Activity, Weighted-average remaining contractual term (in years)          
Balance       8 years 6 months 11 days  
Vested or expected to vest       8 years 6 months 11 days  
Exercisable       7 years 3 months 18 days  
Research and development expense          
Total stock-based compensation | $   27,711 47,431 $ 51,152 43,367
General and administrative          
Total stock-based compensation | $   $ 186,402 $ 194,595 1,100,268 $ 248,846
General and administrative | Chief Executive Officer          
Total stock-based compensation | $       $ 781,266  
2011 stock incentive plan          
Number of grants to be made under Plan | item 0        
2015 Plan          
Number of grants to be made under Plan | item 0        
Common stock remaining for future issuance (in shares) 464,476        
2016 Plan          
Increase in number of shares reserved for issuance 600,000        
Common stock remaining for future issuance (in shares)   995,290   995,290  
Annual share reserve increase (as a percent) 4.00%