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 9 Months Ended
May 18, 2016
item
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
Total stock-based compensation | $   $ 287,774 $ 29,015 $ 1,439,194 $ 321,228
Option Activity, Number of shares          
Balance, beginning of period       959,188  
Granted       869,253  
Balance, end of period   1,828,441   1,828,441  
Vested or expected to vest   1,828,441   1,828,441  
Exercisable   657,099   657,099  
Option Activity, Weighted-average exercise price          
Beginning of period | $ / shares       $ 7.68  
Granted | $ / shares       3.48  
End of period | $ / shares   $ 5.68   5.68  
Vested or expected to vest | $ / shares   5.68   5.68  
Exercisable | $ / shares   $ 8.19   $ 8.19  
Option Activity, Fair value of options granted          
Granted | $   $ 2,124,922   $ 2,124,922  
Option Activity, Weighted-average remaining contractual term (in years)          
Balance       8 years 6 months 15 days  
Vested or expected to vest       8 years 6 months 15 days  
Exercisable       7 years 1 month 6 days  
Research and development expense          
Total stock-based compensation | $   43,861 13,986 $ 95,013 57,353
General and administrative          
Total stock-based compensation | $   $ 243,913 $ 15,029 1,344,181 $ 263,875
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)   691,987   691,987  
Annual share reserve increase (as a percent) 4.00%