March 31,

2021

December 31,

2020

Accrued liabilities:

General and administrative

$

1,275

$

1,577

Clinical trial related costs

1,454

1,743

Non-clinical research and manufacturing operations

4,271

4,321

Payroll related

2,791

4,908

Other accrued expenses

10

26

Total Accrued liabilities

$

9,801

$

12,575