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Bank borrowings - Short-term borrowing (Details) | 1 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2019 CNY (¥) | Apr. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Mar. 21, 2019 CNY (¥) Rate | Dec. 04, 2018 CNY (¥) | Nov. 30, 2018 USD ($) | Nov. 29, 2018 CNY (¥) | Nov. 16, 2018 USD ($) | Nov. 16, 2018 CNY (¥)
Loan Agreement November 29, 2018 |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | ¥ 80,000,000 |  |
Short-term debt |  |  | ¥ 80,000,000 |  |  |  |  |  |  |  |
Loan Agreement December 04, 2018 |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 14,500,000 |  |  |  |  | ¥ 20,000,000 |  |  |  |
Short-term debt |  |  | 20,000,000 |  |  |  |  |  |  |  |
Loan Agreements November 29 and December 02 2018 |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short-term debt | $ | $ 14,600,000 |  |  |  |  |  |  |  |  |  |
Loans Payable | Loan Agreement March, 21, 2019 |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 3,000,000.0 | ¥ 20,000,000 |  |  |  |  |
Interest rate | Rate |  |  |  |  |  | 5.44% |  |  |  |  |
Short-term debt | 2,900,000 |  | ¥ 20,000,000 |  |  |  |  |  |  |  |
Industrial And Commercial Bank of China | Foreign Line of Credit |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.57% |  |  |  | 3.64% |  |  |
Short-term debt | 0 |  |  | $ 10,500,000 |  |  |  | $ 5,000,000 |  | $ 10,300,000 | ¥ 72,000,000
Repayment of short-term debt | $ | $ 10,500,000 | $ 5,000,000 |  |  |  |  |  |  |  |  |

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