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Prepaid Expenses and Other Current Assets (Tables)
 3 Months Ended
Mar. 31, 2021
Prepaid Expense And Other Assets Current [Abstract]  
Summary of Prepaids and Other Current Assets

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

 

 

 

December 31,

2020

 

 

March 31,

2021

 

 

 

(in thousands)

 

Prepaid inventory

 

$

4,361

 

 

$

10,055

 

Restricted cash

 

 

3,250

 

 

 

9,344

 

Prepaid insurance

 

 

1,504

 

 

 

765

 

Other

 

 

1,996

 

 

 

4,413

 

Prepaid and other current assets

 

$

11,111

 

 

$

24,577