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Accounts receivable, net (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounts receivable, net |
Schedule of Accounts Receivable | ​
​ | ​ | ​ | ​ | ​
(In thousands) |  | December 31, 2019 |  | December 31, 2020
Accounts receivable |  | 35,137 |  | 32,312
Less: Allowance for credit losses |  | (7,604) |  | (9,329)
Accounts receivable, net |  | 27,533 |  | 22,983
Schedule of Allowance for Doubtful Accounts | The following table presents movement in the allowance for expected credit loss:
​ | ​ | ​ | ​ | ​ | ​ | ​
(In thousands) |  | December 31, 2018 |  | December 31, 2019 |  | December 31, 2020
Balance at beginning of the year |  | 31 |  | 7,709 |  | 7,604
Additions |  | 7,680 |  | 19 |  | 1,137
Exchange difference |  | (2) |  | (124) |  | 588
Balance at end of the year |  | 7,709 |  | 7,604 |  | 9,329

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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