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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash, Uninsured Amount | $ 134,800,000 |  |
Restricted Cash | 8,040,870 |  | $ 18,005,661
Increase in Restricted Cash | 8,000,000 |  | 18,000,000
Allowance for Doubtful Accounts Receivable, Current | $ 725,356 |  | $ 407,953
Equity Method Investment, Significant Influence Description | Significant influence is generally deemed to exist if the Company has an ownership interest in the voting stock of the investee of between 20% and 50%, although other factors, such as representation on the investee’s board of directors, are considered in determining whether the equity method of accounting is appropriate. |  |
Warrant Liability [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Share Price |  | $ 10.00 |
Percentage For Down round financing |  | 0.00% |
Derivative Asset, Noncurrent |  | $ 5,500,000 |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted Cash Interest Rate | 0.10% |  |
Maximum | Warrant Liability [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Expected term |  | 3 years 9 months |
Risk free interest rate |  | 1.60% |
Expected volatility rate |  | 39.10% |
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted Cash Interest Rate | 0.05% |  |
Minimum | Warrant Liability [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Expected term |  | 3 years 3 months 14 days |
Risk free interest rate |  | 1.50% |
Expected volatility rate |  | 38.90% |
APA ACO [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated Revenue Percentage | 100.00% |  |

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