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Long-term investments - Additional Information (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2020 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Net unrealized gains on investments held |  | $ 794,000 | $ 10,907,000 |
Impairment of long-term investments |  | 794,000 | 19,831,000 | $ 7,794,000
Shanghai Lexiang [Member] |  |  |  |
Percentage of equity interest disposed | 4.82 |  |  |
Consideration for disposal of equity interest |  |  | $ 268,000 |
Net unrealized gains on investments held |  | 794,000 |  |
Impairment of long-term investments |  | $ 794,000 |  |
Chengdu Diting [Member] |  |  |  |
Percent of equity interest owned |  | 12.74% | 12.74% |
Guangzhou Yuechuan [Member] |  |  |  |
Percent of equity interest owned |  | 9.30% | 9.30% |
Zhuhai Qianyou [Member] |  |  |  |
Percent of equity interest owned |  | 19.00% | 19.00% |

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562 + Details
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- Definition The cash inflow associated with the sale of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time). + References No definition available. + Details
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- Definition This element represents disclosure of the amount of gain which has been deferred as the result of the sale of a business or operating assets to a highly leveraged entity under cost method which deferred gain has been reflected in the accompanying statement of financial position as reduction from the related asset. + References No definition available. + Details
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