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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

4.

PREPAID EXPENSES AND OTHER CURRENT ASSETS

Prepaids and other current assets consisted of the following as of December 31, 2020 and September 30, 2021:

 

 

 

December 31,

2020

 

 

September 30,

2021

 

 

 

(in thousands)

 

Prepaid inventory

 

$

4,361

 

 

$

4,901

 

Restricted cash

 

 

3,250

 

 

 

2,000

 

Prepaid insurance

 

 

1,504

 

 

 

3,259

 

Other

 

 

1,996

 

 

 

2,671

 

Prepaid and other current assets

 

$

11,111

 

 

$

12,831