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v3.19.1

Preferred shares (Details) - CNY (¥) ¥ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 336,073 |  |
Balance |  |  | ¥ 336,073 |
Pre-IPO China Best Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 1,947 | ¥ 1,821 | ¥ 1,695
Balance (in shares) |  | 5,660,000 | 5,660,000 | 5,660,000
Issuance of pre-IPO preferred shares |  |  | ¥ 0 |
Issuance of pre-IPO preferred shares |  |  | 0 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 68 | ¥ 126 | ¥ 126
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (2,015) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (5,660,000) |  |
Balance |  | ¥ 0 | ¥ 1,947 | ¥ 1,821
Balance (in shares) |  | 0 | 5,660,000 | 5,660,000
Pre-IPO Series A Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 6,048 | ¥ 5,576 | ¥ 5,109
Balance (in shares) |  | 19,798,750 | 19,798,750 | 19,798,750
Issuance of pre-IPO preferred shares |  |  | ¥ 0 |
Issuance of pre-IPO preferred shares |  |  | 0 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 409 | ¥ 472 | ¥ 467
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (6,457) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (19,798,750) |  |
Balance |  | ¥ 0 | ¥ 6,048 | ¥ 5,576
Balance (in shares) |  | 0 | 19,798,750 | 19,798,750
Pre-IPO Series B-1 Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 9,429 | ¥ 9,047 | ¥ 8,671
Balance (in shares) |  | 12,428,343 | 12,428,343 | 12,428,343
Issuance of pre-IPO preferred shares |  |  | ¥ 0 |
Issuance of pre-IPO preferred shares |  |  | 0 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 330 | ¥ 382 | ¥ 376
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (9,759) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (12,428,343) |  |
Balance |  | ¥ 0 | ¥ 9,429 | ¥ 9,047
Balance (in shares) |  | 0 | 12,428,343 | 12,428,343
Pre-IPO Series B-2 Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 41,831 | ¥ 38,455 | ¥ 35,125
Balance (in shares) |  | 22,742,215 | 22,742,215 | 22,742,215
Issuance of pre-IPO preferred shares |  |  | ¥ 0 |
Issuance of pre-IPO preferred shares |  |  | 0 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 2,922 | ¥ 3,376 | ¥ 3,330
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (44,753) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (22,742,215) |  |
Balance |  | ¥ 0 | ¥ 41,831 | ¥ 38,455
Balance (in shares) |  | 0 | 22,742,215 | 22,742,215
Pre-IPO Series C-1 Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 16,498 | ¥ 15,418 | ¥ 14,352
Balance (in shares) |  | 3,427,812 | 3,427,812 | 3,427,812
Issuance of pre-IPO preferred shares |  |  | ¥ 0 |
Issuance of pre-IPO preferred shares |  |  | 0 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 935 | ¥ 1,080 | ¥ 1,066
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (17,433) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (3,427,812) |  |
Balance |  | ¥ 0 | ¥ 16,498 | ¥ 15,418
Balance (in shares) |  | 0 | 3,427,812 | 3,427,812
Pre-IPO Series C-2 Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 167,869 | ¥ 156,171 | ¥ 144,631
Balance (in shares) |  | 33,408,715 | 33,408,715 | 33,408,715
Issuance of pre-IPO preferred shares |  | ¥ 7,093 | ¥ 0 |
Issuance of pre-IPO preferred shares | 483,702 | 483,702 | 0 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 10,123 | ¥ 11,698 | ¥ 11,540
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (185,085) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (33,892,417) |  |
Balance |  | ¥ 0 | ¥ 167,869 | ¥ 156,171
Balance (in shares) |  | 0 | 33,408,715 | 33,408,715
Pre-IPO Series C+ Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 92,451 | ¥ 0 | ¥ 0
Balance (in shares) |  | 18,855,298 | 0 | 0
Issuance of pre-IPO preferred shares |  |  | ¥ 88,640 |
Issuance of pre-IPO preferred shares |  |  | 18,855,298 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 6,069 | ¥ 3,811 | ¥ 0
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (98,520) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (18,855,298) |  |
Balance |  | ¥ 0 | ¥ 92,451 | ¥ 0
Balance (in shares) |  | 0 | 18,855,298 | 0
Pre-IPO Series C-4 Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 0 | ¥ 0 | ¥ 0
Balance (in shares) |  | 0 | 0 | 0
Issuance of pre-IPO preferred shares |  | ¥ 42,826 | ¥ 0 |
Issuance of pre-IPO preferred shares |  | 7,569,628 | 0 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 1,808 | ¥ 0 | ¥ 0
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (44,634) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (7,569,628) |  |
Balance |  | ¥ 0 | ¥ 0 | ¥ 0
Balance (in shares) |  | 0 | 0 | 0
Pre-IPO Series D-1 Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 0 | ¥ 0 | ¥ 0
Balance (in shares) |  | 0 | 0 | 0
Issuance of pre-IPO preferred shares |  | ¥ 150,811 | ¥ 0 |
Issuance of pre-IPO preferred shares |  | 10,046,551 | 0 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 7,009 | ¥ 0 | ¥ 0
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (157,820) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (10,046,551) |  |
Balance |  | ¥ 0 | ¥ 0 | ¥ 0
Balance (in shares) |  | 0 | 0 | 0
Pre-IPO Series D-2 Preferred Shares |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 0 | ¥ 0 | ¥ 0
Balance (in shares) |  | 0 | 0 | 0
Issuance of pre-IPO preferred shares |  | ¥ 358,567 | ¥ 0 |
Issuance of pre-IPO preferred shares |  | 21,579,948 | 0 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 5,393 | ¥ 0 | ¥ 0
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (363,960) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (21,579,948) |  |
Balance |  | ¥ 0 | ¥ 0 | ¥ 0
Balance (in shares) |  | 0 | 0 | 0
Mezzanine Equity |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Balance |  | ¥ 336,073 | ¥ 226,488 | ¥ 209,583
Balance (in shares) |  | 116,321,133 | 97,465,835 | 97,465,835
Issuance of pre-IPO preferred shares |  | ¥ 559,297 | ¥ 88,640 |
Issuance of pre-IPO preferred shares |  | 39,679,829 | 18,855,298 |
Accretions to pre-IPO preferred shares redemption value |  | ¥ 35,066 | ¥ 20,945 | ¥ 16,905
Redesignation of pre-IPO preferred shares into Class A ordinary shares |  | ¥ (930,436) |  |
Redesignation of pre-IPO preferred shares into Class A ordinary shares (in shares) |  | (156,000,962) |  |
Balance |  | ¥ 0 | ¥ 336,073 | ¥ 226,488
Balance (in shares) |  | 0 | 116,321,133 | 97,465,835

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