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Consolidated Statements of Shareholders' (deficit) Equity - USD ($) | Total | Ordinary Shares | Additional Paid In Capital | Subscription Receivable | Accumulated Deficit | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ (2,950,677) | $ 490 | $ 1,687,048 |  | $ (4,633,488) | $ (4,727)
Balance, Shares at Dec. 31, 2014 |  | 8,166,666 |  |  |  |
Issuance of ordinary shares upon vesting of restricted shares |  | $ 43 | (42) | $ (1) |  |
Issuance of ordinary shares upon vesting of restricted shares, Shares |  | 718,518 |  |  |  |
Share-based compensation | 2,701,404 |  | 2,701,404 |  |  |
Net loss | (18,021,737) |  |  |  | (18,021,737) |
Foreign currency translation adjustments | (98,893) |  |  |  |  | (98,893)
Balance at Dec. 31, 2015 | (18,369,903) | $ 533 | 4,388,410 | (1) | (22,655,225) | (103,620)
Balance, Shares at Dec. 31, 2015 |  | 8,885,184 |  |  |  |
Issuance of ordinary shares upon vesting of restricted shares |  | $ 46 | (42) | (4) |  |
Issuance of ordinary shares upon vesting of restricted shares, Shares |  | 771,991 |  |  |  |
Share-based compensation | 4,925,278 |  | 4,925,278 |  |  |
Net loss | (37,512,212) |  |  |  | (37,512,212) |
Foreign currency translation adjustments | (594,912) |  |  |  |  | (594,912)
Balance at Dec. 31, 2016 | $ (51,551,749) | $ 579 | 9,313,646 | (5) | (60,167,437) | (698,532)
Balance, Shares at Dec. 31, 2016 | 9,657,175 | 9,657,175 |  |  |  |
Issuance of ordinary shares upon vesting of restricted shares |  | $ 100 | (87) | (13) |  |
Issuance of ordinary shares upon vesting of restricted shares, Shares |  | 1,666,145 |  |  |  |
Exercise of shares option | $ 65,500 | $ 6 | 65,494 |  |  |
Exercise of shares option, Shares | 100,834 | 100,834 |  |  |  |
Exercise of warrant | $ 4,700,000 | $ 28 | 4,699,972 |  |  |
Exercise of warrant, Shares |  | 461,808 |  |  |  |
Conversion of convertible preferred shares to ordinary shares | 163,607,144 | $ 1,707 | 163,605,437 |  |  |
Conversion of convertible preferred shares to ordinary shares, Shares |  | 28,443,275 |  |  |  |
Issuance of ordinary shares upon initial public offering, net of issuance cost | 157,654,695 | $ 575 | 157,654,120 |  |  |
Issuance of ordinary shares upon initial public offering, Shares |  | 9,583,333 |  |  |  |
Share-based compensation | 9,931,106 |  | 9,931,106 |  |  |
Net loss | (50,384,176) |  |  |  | (50,384,176) |
Foreign currency translation adjustments | 1,148,440 |  |  |  |  | 1,148,440
Balance at Dec. 31, 2017 | $ 235,170,960 | $ 2,995 | $ 345,269,688 | $ (18) | $ (110,551,613) | $ 449,908
Balance, Shares at Dec. 31, 2017 | 49,912,570 | 49,912,570 |  |  |  |

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