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Contract assets and liabilities (Details 1) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | --- | ---
Deferred revenue | $ | $ 1,076 |  | $ 1,063 |
ZHEJIANG TIANLAN |  |  |  |
Deferred revenue | ¥ |  | ¥ 37,481 |  | ¥ 47,135

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(c)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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