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