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Financial Statements Schedule I - Condensed Balance Sheets (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 229,660,148 | $ 83,948,770 | $ 13,160,696 | $ 7,152,274
Prepayments and other current assets | 954,506 | 143,527 |  |
Total current assets | 230,614,654 | 84,092,297 |  |
Total assets | 249,634,228 | 88,907,285 |  |
Current liabilities: |  |  |  |
Warrant liabilities |  | 3,900,000 |  |
Other payables | 3,101,459 | 750,118 |  |
Total current liabilities | 12,069,144 | 5,173,456 |  |
Deferred income | 2,394,124 | 778,434 |  |
Total liabilities | 14,463,268 | 5,951,890 |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | 134,507,144 |  |
Shareholders' (deficit) equity |  |  |  |
Ordinary shares (par value of US$0.00006 per share; 83,333,333 shares authorized, 9,657,175 and 49,912,570 shares outstanding as of December 31, 2016 and 2017, respectively) | 2,995 | 579 |  |
Subscription receivable | (18) | (5) |  |
Additional paid-in capital | 345,269,688 | 9,313,646 |  |
Accumulated deficit | (110,551,613) | (60,167,437) |  |
Additional other comprehensive (loss) income | 449,908 | (698,532) |  |
Total shareholders' (deficit) equity | 235,170,960 | (51,551,749) | (18,369,903) | (2,950,677)
Total liabilities, mezzanine equity and shareholders' (deficit) equity | 249,634,228 | 88,907,285 |  |
Series A1 Convertible Preferred Shares |  |  |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | 10,028,572 |  |
Series A2 Convertible Preferred Shares |  |  |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | 18,278,572 |  |
Series B1 Convertible Preferred Shares |  |  |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | 53,100,000 |  |
Series B2 Convertible Preferred Shares |  |  |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | 53,100,000 |  |
Parent Company |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 181,910,618 | 24,813,050 | $ 3,114,070 | $ 6,335,498
Prepayments and other current assets | 450,333 |  |  |
Total current assets | 182,360,951 | 24,813,050 |  |
Investment in subsidiaries | 54,885,326 | 62,042,345 |  |
Total assets | 237,246,277 | 86,855,395 |  |
Current liabilities: |  |  |  |
Warrant liabilities |  | 3,900,000 |  |
Other payables | 593,317 |  |  |
Total current liabilities | 593,317 | 3,900,000 |  |
Deferred income | 1,482,000 |  |  |
Total liabilities | 2,075,317 | 3,900,000 |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | 134,507,144 |  |
Shareholders' (deficit) equity |  |  |  |
Ordinary shares (par value of US$0.00006 per share; 83,333,333 shares authorized, 9,657,175 and 49,912,570 shares outstanding as of December 31, 2016 and 2017, respectively) | 2,995 | 579 |  |
Subscription receivable | (18) | (5) |  |
Additional paid-in capital | 345,269,688 | 9,313,646 |  |
Accumulated deficit | (110,551,613) | (60,167,437) |  |
Additional other comprehensive (loss) income | 449,908 | (698,532) |  |
Total shareholders' (deficit) equity | 235,170,960 | (51,551,749) |  |
Total liabilities, mezzanine equity and shareholders' (deficit) equity | $ 237,246,277 | 86,855,395 |  |
Parent Company | Series A1 Convertible Preferred Shares |  |  |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | 10,028,572 |  |
Parent Company | Series A2 Convertible Preferred Shares |  |  |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | 18,278,572 |  |
Parent Company | Series B1 Convertible Preferred Shares |  |  |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | 53,100,000 |  |
Parent Company | Series B2 Convertible Preferred Shares |  |  |  |
Mezzanine equity |  |  |  |
Total mezzanine equity |  | $ 53,100,000 |  |

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