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Commitments and contingencies (Details) - APAT OE arbitration
Oct. 27, 2020
CNY (¥)
Oct. 27, 2020
USD ($)
Mar. 31, 2021
USD ($)
APAT OE      
Commitments And Contingencies Disclosure [Line Items]      
Paid by other party ¥ 58,136,669 $ 8,500,000  
Total amount received (paid)   3,000,000.0  
Payable due to litigation settlement     $ 800,000
Receivable due from litigation settlement     $ 0
APAT HK      
Commitments And Contingencies Disclosure [Line Items]      
Interest received (paid)   (500,000)  
Loss contingency, damages awarded, value   10,031,515  
Total amount received (paid)   10,531,515  
NeoChina | APAT OE      
Commitments And Contingencies Disclosure [Line Items]      
Paid by other party 52,014,519 7,600,000  
Interest received (paid) 6,122,150 $ 900,000  
Total amount received (paid) | ¥ ¥ (58,136,669)