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Balance Sheet Components
 3 Months Ended
Mar. 31, 2022
Accrued Liabilities Current [Abstract]  
Balance Sheet Components

4. Balance sheet components

Accrued liabilities

Accrued liabilities consisted of the following (in thousands):

 

 

March 31,

 

 

December 31,

 

 

 

2022

 

 

2021

 

Accrued research and development costs

 

$

1,572

 

 

$

5,303

 

Product refund liability

 

 

840

 

 

 

—

 

Other liabilities

 

 

1,084

 

 

 

1,080

 

 

 

$

3,496

 

 

$

6,383