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Financial Statements Schedule I - Condensed Balance Sheets (Parenthetical) (Details) - $ / shares | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Apr. 30, 2015 | Aug. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Ordinary shares, par value | $ 0.00006 | $ 0.00006 |  |  |  |
Ordinary shares, shares authorized | 83,333,333 | 83,333,333 |  |  |  |
Ordinary shares, shares outstanding | 49,912,570 | 9,657,175 |  |  |  |
Series A1 Convertible Preferred Shares |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Convertible preferred shares, par value |  | $ 0.00006 |  |  |  | $ 0.00006
Convertible preferred shares, shares authorized |  | 8,466,667 |  |  |  |
Convertible preferred shares, shares issued |  | 8,466,665 |  |  |  | 6,244,443
Convertible preferred shares, shares outstanding |  | 8,466,665 |  |  |  |
Series A2 Convertible Preferred Shares |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Convertible preferred shares, par value |  | $ 0.00006 |  |  | $ 0.00006 |
Convertible preferred shares, shares authorized |  | 8,904,032 |  |  |  |
Convertible preferred shares, shares issued |  | 8,442,221 |  |  | 8,442,221 |
Convertible preferred shares, shares outstanding |  | 8,442,221 |  |  |  |
Series B1 Convertible Preferred Shares |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Convertible preferred shares, par value |  | $ 0.00006 |  | $ 0.00006 |  |
Convertible preferred shares, shares authorized |  | 5,562,337 |  |  |  |
Convertible preferred shares, shares issued |  | 5,562,335 |  | 5,562,335 |  |
Convertible preferred shares, shares outstanding |  | 5,562,335 |  |  |  |
Series B2 Convertible Preferred Shares |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Convertible preferred shares, par value |  | $ 0.00006 | $ 0.00006 |  |  |
Convertible preferred shares, shares authorized |  | 3,973,098 |  |  |  |
Convertible preferred shares, shares issued |  | 3,973,096 | 3,973,096 |  |  |
Convertible preferred shares, shares outstanding |  | 3,973,096 |  |  |  |
Parent Company |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Ordinary shares, par value | $ 0.00006 | $ 0.00006 |  |  |  |
Ordinary shares, shares authorized | 83,333,333 | 83,333,333 |  |  |  |
Ordinary shares, shares outstanding | 49,912,570 | 9,657,175 |  |  |  |
Parent Company | Series A1 Convertible Preferred Shares |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Convertible preferred shares, par value |  | $ 0.00006 |  |  |  |
Convertible preferred shares, shares authorized |  | 8,466,667 |  |  |  |
Convertible preferred shares, shares issued |  | 8,466,665 |  |  |  |
Convertible preferred shares, shares outstanding |  | 8,466,665 |  |  |  |
Parent Company | Series A2 Convertible Preferred Shares |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Convertible preferred shares, par value |  | $ 0.00006 |  |  |  |
Convertible preferred shares, shares authorized |  | 8,904,032 |  |  |  |
Convertible preferred shares, shares issued |  | 8,442,221 |  |  |  |
Convertible preferred shares, shares outstanding |  | 8,442,221 |  |  |  |
Parent Company | Series B1 Convertible Preferred Shares |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Convertible preferred shares, par value |  | $ 0.00006 |  |  |  |
Convertible preferred shares, shares authorized |  | 5,562,337 |  |  |  |
Convertible preferred shares, shares issued |  | 5,562,335 |  |  |  |
Convertible preferred shares, shares outstanding |  | 5,562,335 |  |  |  |
Parent Company | Series B2 Convertible Preferred Shares |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Convertible preferred shares, par value |  | $ 0.00006 |  |  |  |
Convertible preferred shares, shares authorized |  | 3,973,098 |  |  |  |
Convertible preferred shares, shares issued |  | 3,973,096 |  |  |  |
Convertible preferred shares, shares outstanding |  | 3,973,096 |  |  |  |

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