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Accounts receivable, net (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounts receivable, net [Abstract] |
Schedule of Accounts Receivable |
(In thousands) |  | December 31, 2016 |  | December 31, 2017 |
Accounts receivable |  |  | 14,655 |  |  | 40,663 |
Less: Allowance for doubtful accounts |  |  | (119) |  |  | (31) |
Accounts receivable, net |  |  | 14,536 |  |  | 40,632 |
Schedule of Allowance for Doubtful Accounts | The following table presents movement in the allowance for doubtful accounts:
(In thousands) |  | December 31, 2015 |  | December 31, 2016 |  | December 31, 2017 |
Balance at beginning of the year |  |  | 131 |  |  | 126 |  |  | 119 |
Additions |  |  | 4 |  |  | — |  |  | 27 |
Write-off |  |  | — |  |  | — |  |  | (122) |
Exchange difference |  |  | (9) |  |  | (7) |  |  | 7 |
Balance at end of the year |  |  | 126 |  |  | 119 |  |  | 31 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + 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://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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