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Preferred shares (Detail Textuals) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) shares | Jun. 30, 2018 USD ($) shares | Jun. 30, 2017 CNY (¥) shares | Jun. 30, 2017 USD ($) shares | Aug. 31, 2014 USD ($) shares | Sep. 30, 2013 USD ($) shares | Mar. 31, 2013 USD ($) shares | Dec. 31, 2018 CNY (¥) director shares | Dec. 31, 2018 USD ($) director shares
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of convertible loans | ¥ |  |  |  |  |  |  |  | ¥ 930,436 |
Percentage of amount received inclueds preferred share purchase price, plus all declared but unpaid dividend in case of dissolution or winding up of the Company or sale of shares, merger, consolidation or other similar transaction |  |  |  |  |  |  |  | 100.00% | 100.00%
Number of director appointed by ordinary shareholders | director |  |  |  |  |  |  |  | 3 | 3
Group of investors |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  |  |  |  |  |  |  | $ 125,100
K2 Evergreen Partners L.P. and K2 Partners II L.P. jointly right |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Number of director appointed by ordinary shareholders | director |  |  |  |  |  |  |  | 1 | 1
BAI GmbH has the right to appoint one director; Highland Capital Partners 9 L.P., Highland Capital Partners 9-B L.P. and Highland Entrepreneurs? Fund 9 L.P. jointly right |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Number of director appointed by ordinary shareholders | director |  |  |  |  |  |  |  | 1 | 1
AlphaX Partners Fund I, L.P., and Beijing Z-Park Fund jointly right |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Number of director appointed by ordinary shareholders | director |  |  |  |  |  |  |  | 1 | 1
Series B-1 preferred shares |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Conversion ratio of preferred shares converted in to ordinary shares |  |  |  |  |  |  |  | 11 | 11
Preferred share redemption right |  |  |  |  |  |  |  | For Series B-1 and B-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series B-1 and B-2 preferred shares issue date | For Series B-1 and B-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series B-1 and B-2 preferred shares issue date
Percentage of interest on original issue price |  |  |  |  |  |  |  | 10.00% | 10.00%
Series B-2 preferred shares |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Conversion ratio of preferred shares converted in to ordinary shares |  |  |  |  |  |  |  | 11 | 11
Preferred share redemption right |  |  |  |  |  |  |  | For Series B-1 and B-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series B-1 and B-2 preferred shares issue date | For Series B-1 and B-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series B-1 and B-2 preferred shares issue date
Percentage of interest on original issue price |  |  |  |  |  |  |  | 10.00% | 10.00%
Series C-1 preferred shares |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Conversion ratio of preferred shares converted in to ordinary shares |  |  |  |  |  |  |  | 11 | 11
Preferred share redemption right |  |  |  |  |  |  |  | For Series C-1 and C-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C-1 and C-2 preferred shares issue date | For Series C-1 and C-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C-1 and C-2 preferred shares issue date
Percentage of interest on original issue price |  |  |  |  |  |  |  | 8.00% | 8.00%
Series C-2 preferred shares |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Conversion ratio of preferred shares converted in to ordinary shares |  |  |  |  |  |  |  | 11 | 11
Preferred share redemption right |  |  |  |  |  |  |  | For Series C-1 and C-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C-1 and C-2 preferred shares issue date | For Series C-1 and C-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C-1 and C-2 preferred shares issue date
Percentage of interest on original issue price |  |  |  |  |  |  |  | 8.00% | 8.00%
Series A financing |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  |  |  |  |  | $ 700,000 |  |
Series A financing | China Best |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from share issued | ¥ |  |  |  |  |  |  |  | ¥ 1,260,000 |
Shares Issued |  |  |  |  |  |  |  | 5,660,000 | 5,660,000
Conversion ratio of preferred shares converted in to ordinary shares |  |  |  |  |  |  |  | 11 | 11
Preferred share redemption right |  |  |  |  |  |  |  | For China Best and Series A preferred shares, they can be redeemed at any time after the sixth (6th) anniversary of the China Best and Series A Preferred Shares issue date | For China Best and Series A preferred shares, they can be redeemed at any time after the sixth (6th) anniversary of the China Best and Series A Preferred Shares issue date
Percentage of interest on original issue price |  |  |  |  |  |  |  | 10.00% | 10.00%
Series A financing | K2 Evergreen Partner L.P. |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  |  | 2,828,393 |  |
Series A financing | K2 Partners II L.P. |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  |  | 16,970,357 |  |
Series B financing |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  |  |  |  | $ 5,564,856 |  |  |
Series B financing | Series B-1 preferred shares | K2 Evergreen Partner L.P. |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  | 4,142,781 |  |  |
Series B financing | Series B-1 preferred shares | K2 Partners II L.P. |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  | 8,285,562 |  |  |
Series B financing | Series B-2 preferred shares | K2 Partners II L.P. |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  | 4,548,443 |  |  |
Series B financing | Series B-2 preferred shares | BAI GmbH |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  | 18,193,772 |  |  |
Series C financing |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  |  |  | $ 23,658,593 |  |  |  |
Series C financing | Series C-1 preferred shares | BAI GmbH |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 3,427,812 |  |  |  |
Series C financing | Series C-2 preferred shares | BAI GmbH |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 5,643,437 |  |  |  |
Series C financing | Series C-2 preferred shares | Highland Capital Partners 9 Limited Partnership |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 18,290,377 |  |  |  |
Series C financing | Series C-2 preferred shares | Highland Capital Partners 9-B Limited Partnership |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 7,878,398 |  |  |  |
Series C financing | Series C-2 preferred shares | Highland Entrepreneurs? Fund 9 Limited Partnership |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 1,596,503 |  |  |  |
Series C+ financing |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  |  | $ 8,682,770 |  |  |  |  |
Conversion ratio of preferred shares converted in to ordinary shares |  |  |  |  |  |  |  | 11 | 11
Preferred share redemption right |  |  |  |  |  |  |  | For Series C+ preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C+ preferred shares issue date | For Series C+ preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C+ preferred shares issue date
Percentage of interest on original issue price |  |  |  |  |  |  |  | 8.00% | 8.00%
Series C+ financing | K2 Partners II L.P. |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 2,175,611 | 2,175,611 |  |  |  |  |
Series C+ financing | K2 Family Partners Limited |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 725,204 | 725,204 |  |  |  |  |
Series C+ financing | BAI GmbH |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 1,450,408 | 1,450,408 |  |  |  |  |
Series C+ financing | Highland Capital Partners 9 Limited Partnership |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 1,910,912 | 1,910,912 |  |  |  |  |
Series C+ financing | Highland Capital Partners 9-B Limited Partnership |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 823,106 | 823,106 |  |  |  |  |
Series C+ financing | Highland Entrepreneurs? Fund 9 Limited Partnership |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 166,797 | 166,797 |  |  |  |  |
Series C+ financing | AlphaX Partners Fund I, L.P. |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 5,341,517 | 5,341,517 |  |  |  |  |
Series C+ financing | Puhua |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of convertible loans | ¥ |  |  | ¥ 30,000 |  |  |  |  |  |
Number of shares issued for conversion of convertible loan |  |  | 6,261,743 | 6,261,743 |  |  |  |  |
Series C-4 financing |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of convertible loans | $ |  | $ 6,300 |  |  |  |  |  |  |
Number of shares issued for conversion of convertible loan |  | 7,569,628 |  |  |  |  |  |  |
Conversion ratio of preferred shares converted in to ordinary shares |  |  |  |  |  |  |  | 11 | 11
Preferred share redemption right |  |  |  |  |  |  |  | For Series C-4 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series C-4 preferred shares issue date | For Series C-4 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series C-4 preferred shares issue date
Percentage of interest on original issue price |  |  |  |  |  |  |  | 10.00% | 10.00%
Series D-1 financing |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  | $ 23,350,000 |  |  |  |  |  |  |
Conversion ratio of preferred shares converted in to ordinary shares |  |  |  |  |  |  |  | 11 | 11
Preferred share redemption right |  |  |  |  |  |  |  | For Series D-1 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series D-1 preferred shares issue date | For Series D-1 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series D-1 preferred shares issue date
Percentage of interest on original issue price |  |  |  |  |  |  |  | 10.00% | 10.00%
Series D-1 financing | ACEE Capital Ltd. |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  | 3,592,664 |  |  |  |  |  |  |
Series D-1 financing | Honour Depot Limited |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares Issued |  | 6,453,887 |  |  |  |  |  |  |
Series D-2 financing |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Conversion ratio of preferred shares converted in to ordinary shares |  |  |  |  |  |  |  | 11 | 11
Preferred share redemption right |  |  |  |  |  |  |  | For Series D-2 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series D-2 preferred shares issue date | For Series D-2 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series D-2 preferred shares issue date
Percentage of interest on original issue price |  |  |  |  |  |  |  | 10.00% | 10.00%
Series D-2 financing | Beijing Z-Park Fund |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ | $ 50,000 |  |  |  |  |  |  |  |
Shares Issued | 20,630,925 |  |  |  |  |  |  |  |

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