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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2019
Accounts Receivable Net Current [Abstract]  
Summary of Accounts Receivable

Accounts receivable consisted of the following as of December 31, 2018 and 2019:

 

 

 

December 31,

2018

 

 

December 31,

2019

 

Trade accounts receivable

 

$

1,403

 

 

$

1,094

 

Allowance for doubtful accounts

 

 

—

 

 

 

(35

)

Accounts receivable—net

 

$

1,403

 

 

$

1,059