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v3.21.1

Accounts receivable, net | 12 Months Ended
--- | ---
Dec. 31, 2020
Accounts receivable, net. |
Accounts receivable, net | 4. Accounts receivable, net ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Trade accounts receivable | ​ | $ | 21,422,782 | ​ | $ | 22,862,706
Receivable from OC-BVI | ​ |  | 62,171 | ​ |  | 10,808
Other accounts receivable | ​ |  | 269,133 | ​ |  | 222,381
​ | ​ |  | 21,754,086 | ​ |  | 23,095,895
Allowance for doubtful accounts | ​ |  | (270,110) | ​ |  | (142,236)
Accounts receivable, net | ​ | $ | 21,483,976 | ​ | $ | 22,953,659
​ The activity for the allowance for doubtful accounts consisted of: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Opening allowance for doubtful accounts | ​ | $ | 142,236 | ​ | $ | 158,902
Provision for doubtful accounts | ​ |  | 129,107 | ​ |  | —
Accounts written off during the year | ​ |  | (1,233) | ​ |  | (16,666)
Ending allowance for doubtful accounts | ​ | $ | 270,110 | ​ | $ | 142,236
​ Significant concentrations of credit risk are disclosed in Note 18.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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