| Accrued expenses |
4. Accrued expenses
Accrued expenses consisted of the following (in thousands):
|
|
|
|
|
|
|
|
|
|
|
|
As of
|
|
|
|
|
March 31,
|
|
December 31,
|
|
|
|
|
2016
|
|
2015
|
|
|
Patent and license fees
|
|
$
|
5,290
|
|
$
|
3,395
|
|
|
Deferred initial public offering costs
|
|
|
—
|
|
|
283
|
|
|
Employee compensation costs
|
|
|
677
|
|
|
1,016
|
|
|
Professional services
|
|
|
1,048
|
|
|
382
|
|
|
Other
|
|
|
236
|
|
|
380
|
|
|
Total
|
|
$
|
7,251
|
|
$
|
5,456
|
|
|