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Summary of Significant Accounting Policies - Additional Information (Details) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2017 | Apr. 01, 2016 USD ($) | Dec. 31, 2017 USD ($) Segment shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 CNY (¥) shares | Jul. 19, 2017 shares | Dec. 31, 2016 CNY (¥) | Dec. 31, 2014 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Impairment of investments |  |  | $ 0 | $ 0 | $ 0 |  |  |  |
Externally purchased software, amortization period |  |  | 5 years |  |  |  |  |  |
Original value of intangible assets |  |  | $ 24,377 | 8,684 |  |  |  |  |
Accumulated amortization |  |  | 4,288 | 1,684 |  |  |  |  |
Impairment of long-lived assets |  |  | $ 0 | $ 0 | 0 |  |  |  |
Investment threshold amount |  | $ 7,000,000 |  |  |  |  |  |  |
Vesting date |  | Apr. 01, 2016 |  | Apr. 01, 2016 |  |  |  |  |
Maturity period stated in terms |  |  | 6 years |  |  |  |  |  |
Cash grants recorded in other income |  |  | $ 855,158 | $ 2,065,510 | 298,072 |  |  |  |
Cash grants recorded in deferred income |  |  | $ 912,124 | 778,434 |  |  |  |  |
Reimbursement recognized period |  |  | 5 years |  |  |  |  |  |
Capital leases |  |  | $ 0 | 0 | 0 |  |  |  |
Unrecognized tax benefits and related interest and penalties |  |  | $ 0 | 0 | 0 |  |  |  |
Number of reportable segments | Segment |  |  | 1 |  |  |  |  |  |
Aggregate amount of cash and cash equivalents |  |  | $ 229,660,148 | $ 83,948,770 | $ 13,160,696 |  |  |  | $ 7,152,274
Share consolidation of ordinary shares and preferred shares | six-to-one |  |  |  |  |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized future minimum operating lease commitments |  |  | $ 3,000,000 |  |  |  |  |  |
Cash and Cash Equivalents |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of foreign currency risk |  |  | 2.00% | 8.00% |  |  |  |  |
Foreign Currency Risk | Cash and Cash Equivalents |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Aggregate amount of cash and cash equivalents | ¥ |  |  |  |  |  | ¥ 25,660,869 |  | ¥ 44,156,161 |
Deferred Income |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Reimbursements recognized |  |  | $ 1,482,000 |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Reimbursements recognized |  |  | $ 78,000 |  |  |  |  |  |
Series A2 Convertible Preferred Shares |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Issuance warrants to purchase preferred shares | shares |  |  | 461,808 |  |  | 461,808 | 461,808 |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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