Accrued expenses consist of the following (in thousands):
As of December 31,
2015
2014
Accrued clinical trial costs
$
2,631
848
Accrued contract manufacturing expenses
945
580
Accrued compensation and benefits
1,864
983
Accrued interest
136
574
Other accrued expenses
883
663
Total accrued expenses
6,459
3,648