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Share-based Compensation - Non-vested Restricted Shares - Additional Information (Details) |  |  |  |  |  | 12 Months Ended |  |  |
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Sep. 20, 2017 shares | Aug. 25, 2016 Installment shares | Jul. 15, 2016 Installment shares | Aug. 10, 2015 Installment shares | Apr. 03, 2014 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) shares | May 31, 2017 shares | Mar. 31, 2017 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of non-vested restricted shares |  |  |  |  |  | 693,333 | 2,309,490 |  |  |  |
Non-Vested Restricted Shares |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share issued to secure services |  |  |  |  | 3,500,000 |  |  |  |  |  |
Compensation expenses, deemed service period |  |  |  |  | 5 years |  |  |  |  |  |
Shares granted |  | 75,000 | 58,333 | 166,667 |  |  |  |  |  |  |
Restricted period of sale or transfer of shares |  |  |  | 3 years |  |  |  |  |  |  |
Share repurchase right termination period |  | 3 years | 3 years | 3 years |  |  |  |  |  |  |
Number of installments for repurchase right termination | Installment |  | 36 | 36 | 36 |  |  |  |  |  |  |
Description of repurchase right termination |  |  |  |  |  | The Repurchase Right terminates over the three years commencing August 10, 2015, July 15, 2016 and August 25, 2016 in 36 equal monthly instalments thereafter, or immediately prior to the consummation of an IPO of the Company. |  |  |  |  |
Unrecognized share-based compensation | $ |  |  |  |  | $ 840,000 | $ 1,517,160 |  |  | $ 2,421,288 |  |
Compensation expense | $ |  |  |  |  |  | $ 5,179,173 | $ 1,400,545 | $ 2,281,695 |  |  |
Non-Vested Restricted Shares | CEO |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of non-vested restricted shares |  |  |  |  |  |  |  |  |  | 2,100,000 | 2,100,000
Non-Vested Restricted Shares | Independent Directors |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares granted | 50,000 |  |  |  |  |  |  |  |  |  |
Non-Vested Restricted Shares | Individual Advisors |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of non-vested restricted shares |  |  |  |  |  |  |  |  | 134,516 |  |
Non-Vested Restricted Shares | Each yearly anniversary from the date of the agreement |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting percentage | 33.33% |  |  |  | 20.00% |  |  |  |  |  |

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