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Accounts receivable, net (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CNY (¥)
--- | --- | --- | --- | ---
Accounts receivable | $ 3,586 |  | $ 5,089 |
ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | ¥ 138,778 |  | ¥ 153,585
Current |  |  |  |
Accounts receivable | 1,495 |  | 4,485 |
1 - 30 days past due |  |  |  |
Accounts receivable | 41 |  | 200 |
31 - 60 days past due |  |  |  |
Accounts receivable | 1,343 |  | 38 |
61 - 90 days past due |  |  |  |
Accounts receivable | 99 |  | 17 |
Greater than or equal to 91 days |  |  |  |
Accounts receivable | 608 |  | 349 |
Past due |  |  |  |
Accounts receivable | $ 2,091 |  | $ 604 |
Within 1 year | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | 96,456 |  | 119,233
1 year - 2 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | 30,252 |  | 21,182
2 years - 3 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | 6,260 |  | 9,492
3 years - 4 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | 5,179 |  | 3,225
4 years - 5 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ |  | ¥ 631 |  | ¥ 453

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