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v3.19.1

Short-term and long-term borrowings (Detail Textuals) $ / shares in Units, ¥ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2018 shares | Mar. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Sep. 30, 2018 CNY (¥) | Jun. 30, 2018 CNY (¥) | Mar. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) shares | Sep. 30, 2017 CNY (¥) | Jun. 30, 2017 CNY (¥) | Mar. 31, 2017 CNY (¥) | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 CNY (¥) | Dec. 31, 2017 $ / shares | Sep. 12, 2017 CNY (¥) | Aug. 07, 2017 CNY (¥) | Jul. 31, 2017 CNY (¥) | Jul. 21, 2017 CNY (¥) | Apr. 01, 2017 CNY (¥)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | ¥ 20,000 |  |  |  |  |  |  |  | ¥ 20,000 |  |  |  |  |  |  |  |  |  |
Minimum new equity financing investment round |  |  |  |  |  |  |  |  |  | ¥ 50,000 |  |  |  |  |  |  |  |  |  |  |  |
Expected minimum quarterly gross profit |  |  |  |  |  |  | ¥ 25,000 | ¥ 35,000 | ¥ 32,000 | ¥ 28,000 | ¥ 20,000 |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  | 200,000 | ¥ 150,000 | ¥ 120,000 | ¥ 65,000 |  |  |  |  | 651,013 | $ 94,686,000 | ¥ 280,666 |  | ¥ 117,353 |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  | 11,108 |  |  |  |  |  | ¥ 11,108 |  |  |  |  |  |  |  |
Term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 10,000 |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |
Revolving loan credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 10,000 |  |  |  |  |  |  |  | ¥ 10,000 |  |  |  |  |  |  |  |  |  |
Series C-2 preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred shares | shares |  | 483,702 |  |  |  |  |  |  |  |  |  | 483,702 | 483,702 | 0 | 0 |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  | ¥ 65,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
7.25% SPD Silicon Valley Bank loan Term loan I due on 30 March 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | [1] |  |  | ¥ 9,944 |  |  |  | 9,944 |  |  |  | ¥ 9,944 |  | ¥ 9,944 |  |  |  |  |  |  |  |
7.25% SPD Silicon Valley Bank loan Term loan I due on 30 March 2018 | Term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 1,900 | ¥ 8,000
7.5% SPD Silicon Valley Bank loan Revolving loan II due on 31 December 2018 | Revolving loan credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 2,500 | ¥ 5,900 | ¥ 1,600 |  |
4.35% SPD Silicon Valley Bank loan Secured loan III due on 28 December 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance of secured debt |  |  |  |  |  |  |  | ¥ 11,100 |  |  |  |  |  | ¥ 11,100 |  |  |  |  |  |  |  |
4.35% SPD Silicon Valley Bank loan Secured loan III due on 28 December 2018 | China Equities Hong Kong Limited ("China Equities") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cash consideration a warrant granted | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 621 |  |  |  |  |  |  |
Number of granted warrant | shares |  |  |  |  |  |  |  | 670,814 |  |  |  |  |  | 670,814 |  |  |  |  |  |  |  |
Exercise price of warrant | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.64829 |  |  |  |  |
[1] | The Group was granted an RMB20.0 million credit facility that will expire on June 30, 2019 for general corporate purposes. There into, RMB10.0 million is allocated to a term loan facility and RMB10.0 million is a revolving loan credit facility. The credit facility was guaranteed by the Company.

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