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Contract assets and liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Contract assets and liabilities | Contract assets consisted of the following at December 31:
|  | 2019 |  |  | 2018 |
|  | US$’000 |  |  | US$’000 |
Unbilled revenue |  |  | 441 |  |  |  | 899 |
Contract liabilities consisted of the following at December 31:
|  | 2019 |  |  | 2018 |
|  | US$’000 |  |  | US$’000 |
Deferred revenue |  |  | 869 |  |  |  | 1,370 |
The following table provides information about contract assets and contract liabilities from contracts with customers:
|  | December 31, |
|  | 2019 |  |  | 2018 |
|  | US$’000 |  |  | US$’000 |
Contract assets |  |  | 441 |  |  |  | 899 |
Contract liabilities |  |  | (869 | ) |  |  | (1,370 | )
Net contract liabilities |  |  | (428 | ) |  |  | (471 | )
Net (liability) / asset position for contracts in process | The net liabilities position for contracts in process consisted of the following at December 31:
|  | 2019 |  |  | 2018 |
|  | US$’000 |  |  | US$’000 |
Cost and estimated earnings on uncompleted contracts |  |  | 5,150 |  |  |  | 6,354 |
Less: billings to date |  |  | (5,578 | ) |  |  | (6,825 | )
|  |  | (428 | ) |  |  | (471 | )
The net liabilities position for contracts in process is included within the contract asset and contract liability in the accompanying consolidated balance sheets as follows at December 31:
|  | 2019 |  |  | 2018 |
|  | US$’000 |  |  | US$’000 |
Unbilled revenue |  |  | 441 |  |  |  | 899 |
Deferred revenue |  |  | (869 | ) |  |  | (1,370 | )
|  |  | (428 | ) |  |  | (471 | )
ZHEJIANG TIANLAN |
Contract assets and liabilities | Contract assets consisted of the following at December 31:
|  | 2019 |  |  | 2018 |
|  | RMB’000 |  |  | RMB’000 |
Unbilled revenue |  |  | 80,961 |  |  |  | 100,994 |
Contract liabilities consisted of the following at December 31:
|  | 2019 |  |  | 2018 |
|  | RMB’000 |  |  | RMB’000 |
Deferred revenue |  |  | 55,898 |  |  |  | 41,046 |
The following table provides information about contract assets and contract liabilities from contracts with customers:
|  | 2019 |  |  | 2018 |
|  | RMB’000 |  |  | RMB’000 |
Contract assets |  |  | 80,961 |  |  |  | 100,994 |
Contract liabilities |  |  | (55,898 | ) |  |  | (41,046 | )
Net contract assets |  |  | 25,063 |  |  |  | 59,948 |
Net (liability) / asset position for contracts in process |
|  | 2019 |  |  | 2018 |
|  | RMB’000 |  |  | RMB’000 |
Costs and estimated earnings on uncompleted contracts |  |  | 433,195 |  |  |  | 236,044 |
Less: billings to date |  |  | (352,234 | ) |  |  | (135,050 | )
|  |  | 80,961 |  |  |  | 100,994 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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