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Share-based Compensation - Share Options - Additional Information (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 05, 2015 | Sep. 30, 2017 | May 31, 2017 | Dec. 31, 2016 | Aug. 31, 2016 | Mar. 31, 2016 | Oct. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 25, 2016 | Mar. 09, 2016 | Oct. 22, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized | 4,140,945 |  |  |  |  |  |  |  |  |  |  | 7,369,767 | 7,369,767 | 7,369,767
Contractual term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  | 264,480 | 2,918,993 | 4,309,232 |  |  |
Exercise price of options |  |  |  |  |  |  |  |  | $ 8.76 | $ 1.53 | $ 0.60 |  |  |
Weighted-average grant-date fair value of options granted |  |  |  |  |  |  |  |  | $ 13.92 | $ 6.94 | $ 1.62 |  |  |
Management and employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term |  | 10 years | 10 years |  | 10 years | 10 years | 10 years | 10 years |  |  |  |  |  |
Vesting period |  | 5 years |  |  | 5 years | 5 years | 5 years | 5 years |  |  |  |  |  |
Options granted |  | 101,584 | 158,313 |  | 1,760,368 | 1,157,793 | 3,438,783 | 870,449 |  |  |  |  |  |
Exercise price of options |  | $ 18.0 | $ 3.0 |  | $ 1.74 | $ 1.2 | $ 0.6 | $ 0.6 |  |  |  |  |  |
Management and employees | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Management and employees | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Management and employees | Vesting one year after the grant date and the remainder monthly basis thereafter |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |  |  |
Management and employees | Vesting anniversary year after the grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  | 20.00% |  |  | 20.00% | 20.00% |  |  |  |  |  |  |  |
Management and employees | Vesting anniversary year after the grant date | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |
Management and employees | Vesting anniversary year after the grant date | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |
Individual Advisors |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term |  |  | 10 years | 10 years | 10 years |  |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years | 3 years | 3 years |  |  |  |  |  |  |  |  |
Options granted |  |  | 4,583 | 416 | 416 |  |  |  |  |  |  |  |  |
Exercise price of options |  |  | $ 3.0 | $ 1.74 | $ 1.74 |  |  |  |  |  |  |  |  |
Individual Advisors | Vesting anniversary year after the grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  | 33.33% | 33.33% | 33.33% |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  |  |  |  |  |  | $ 4,751,933 | $ 3,524,733 | $ 419,709 |  |  |
Unrecognized compensation expense related to unvested share options granted |  |  |  |  |  |  |  |  | $ 18,419,319 |  |  |  |  |
Recognized over a weighted-average period |  |  |  |  |  |  |  |  | 3 years 18 days |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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