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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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