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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2020
Accounts Receivable Net Current [Abstract]  
Summary of Accounts Receivable

Accounts receivable consisted of the following as of December 31, 2019 and 2020 (in thousands):

 

 

 

December 31,

2019

 

 

December 31,

2020

 

Trade accounts receivable

 

$

1,094

 

 

$

5,747

 

Allowance for doubtful accounts

 

 

(35

)

 

 

—

 

Accounts receivable—net

 

$

1,059

 

 

$

5,747