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v3.20.2

Bank borrowings - Short-term borrowing (Details) | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |  |
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Feb. 29, 2020 USD ($) | Jan. 31, 2020 USD ($) | Oct. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) Rate | Jun. 30, 2020 CNY (¥) | Apr. 15, 2020 USD ($) | Apr. 15, 2020 CNY (¥) | Oct. 31, 2019 CNY (¥) | Sep. 23, 2019 USD ($) | Sep. 23, 2019 CNY (¥) | Mar. 31, 2019 USD ($) | Mar. 21, 2019 CNY (¥) Rate | Dec. 31, 2018 USD ($) | Dec. 04, 2018 CNY (¥) | 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 |  |
Loan Agreement December 04, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,500,000 | ¥ 20,000,000 |  |  |
Short-term debt |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable | Loan Agreement, April 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 14,300,000 | ¥ 100,000,000 |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 11,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable | Loan Agreement, April 15, 2020, Working Capital Borrowing in Chinese Yuan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |
Loans Payable | Loan Agreement, April 15, 2020, Collateralized Borrowings in US Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  | ¥ 80,000,000 |  |  |  |  |  |  |  |  |  |
Loans Payable | Loan Agreement, April 15, 2020, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from short-term debt |  |  |  | $ 2,800,000 | ¥ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | Rate |  |  |  | 5.1375% |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable | Loan Agreement, April 15, 2020, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from short-term debt |  |  |  | $ 7,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | Rate |  |  |  | 2.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Payable | Loan Agreement, April 15, 2020, Tranche Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from short-term debt |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | Rate |  |  |  | 2.80% |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Line of Credit | Loan Agreement September 23, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 7,100,000 | ¥ 50,000,000.0 |  |  |  |  |  |  |
Proceeds from lines of credit | $ 5,500,000 | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank Of Communications Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 8,500,000 |  |  |  |  | ¥ 60,000,000.0 |  |  |  |  |  |  |  |  |
Industrial And Commercial Bank of China | Foreign Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  | $ 10,300,000 | ¥ 72,000,000.0
Base Rate | China | Bank Of Communications Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread multiple |  |  | 1.05 |  |  |  |  | 1.05 |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 4.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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