Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details)

v3.5.0.2
Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accrued Liabilities    
Employee compensation and benefits $ 1,172 $ 709
External research and preclinical development 2,096 981
Professional fees 767 399
Restricted stock liability 5 1
Facilities   414
Total accrued expenses $ 4,040 $ 2,504