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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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