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Bank borrowings - Narrative (Details) $ in Millions						1 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 CNY (¥)	Mar. 12, 2019 USD ($)	May 09, 2018 USD ($)	Aug. 15, 2017 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 CNY (¥)	Jun. 30, 2019 CNY (¥)	Mar. 12, 2019 CNY (¥)	Jul. 31, 2018 USD ($)	May 09, 2018 CNY (¥)	May 01, 2018 USD ($)	Jan. 12, 2018 USD ($)
Secured Debt
Line of Credit Facility [Line Items]
Maximum borrowing capacity												$ 17.8
Amount outstanding	$ 16.8
Stated interest rate												5.04%
Variable Interest Rate Term Loan Maturing August 2022 | Secured Debt | Term Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 30.0
Amount outstanding	24.2									$ 16.7			$ 13.2
Debt term					5 years
Variable Interest Rate Term Loan Maturing August 2022 | Minimum | LIBOR | Secured Debt | Term Loan
Line of Credit Facility [Line Items]
Basis spread on variable rate					1.75%
Variable Interest Rate Term Loan Maturing August 2022 | Maximum | LIBOR | Secured Debt | Term Loan
Line of Credit Facility [Line Items]
Basis spread on variable rate					2.25%
YinHai Leasing Company and China Import/Export Bank | Lease Financing
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 62.8							¥ 400,000,000
Sale leaseback transaction, nominal amount for selling equipment back to joint venture | ¥											¥ 1
Amount outstanding	54.7							¥ 376,000,000
Export-Import Bank Of China [Member]
Line of Credit Facility [Line Items]
Restricted cash			$ 2.0						¥ 14,000,000
Line of credit facility, maximum month-end outstanding amount	$ 27.7	¥ 190,000,000
Export-Import Bank Of China [Member] | Secured Debt
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 29.8						¥ 200,000,000
Proceeds from lines of credit						$ 28.3	¥ 190,000,000
China Base Rate multiplier			1.1
Interest rate during period including China Base Rate			5.39%
Period for payments of principal			6 months
China | YinHai Leasing Company and China Import/Export Bank | Lease Financing | Base Rate
Line of Credit Facility [Line Items]
Basis spread multiple				1.15							1.15
Basis spread on variable rate				5.4625%

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