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Prepaid Expenses and Other Current Assets
 9 Months Ended
Sep. 30, 2021
Prepaid Expense And Other Assets Current [Abstract]  
Prepaid Expenses and Other Current Assets

6. Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

 

 

 

September 30,
2021

 

 

December 31,
2020

 

Prepaid maintenance and other

 

$

655

 

 

$

761

 

Prepayments to CRO's

 

 

1,643

 

 

 

420

 

Prepayments to CMO's

 

 

1,340

 

 

 

135

 

Prepaid insurance

 

 

449

 

 

 

1,443

 

Tax receivable

 

 

2,711

 

 

 

2,711

 

Interest receivable

 

 

—

 

 

 

23

 

Other current assets

 

 

1

 

 

 

229

 

Total prepaid expenses and other current assets

 

$

6,799

 

 

$

5,722