v3.20.4

Accounts receivables, net (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Accounts receivables, net |
Schedule of allowance for doubtful accounts | ​
​ | ​ | ​ | ​
​ | ​ | Allowance for
​ |  | Doubtful Accounts
Balance, December 31, 2017 |  | $ | 863
Additions charged to operations |  | ​ | 363
Deductions from reserves, net |  | ​ | (43)
Balance, December 31, 2018 |  | ​ | 1,183
Additions charged to operations |  | ​ | 181
Deductions from reserves, net |  | ​ | (278)
Balance, December 31, 2019 | ​ | ​ | 1,086
Additions charged to operations | ​ |  | 28
Deductions from reserves, net | ​ | ​ | (106)
Balance, December 31, 2020 | ​ | $ | 1,008

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