Annual report pursuant to Section 13 and 15(d)

ACCOUNTS RECEIVABLE - Allowance for doubtful accounts (Details)

v3.20.4
ACCOUNTS RECEIVABLE - Allowance for doubtful accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
ACCOUNTS RECEIVABLE    
Balance at beginning of year $ 199  
Provision for bad debt 377 $ 199
Uncollectible accounts written off (76)  
Balance at end of year $ 500 $ 199