Significant Accounting Policies - Additional Information (Detail) |
12 Months Ended | |
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Dec. 31, 2017
USD ($)
Segment
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Dec. 31, 2016
USD ($)
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| Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] | ||
| Cash and cash equivalents with original maturity period | Three months or less | |
| Number of business operating segment | Segment | 1 | |
| Impairment losses | $ 0 | $ 0 |
| Uncertain income tax position, unrecognized | Less than a 50% | |
| Uninsured portion of cash balance | $ 5,916,143 | $ 3,830,618 |
| Leasehold Improvements [Member] | ||
| Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] | ||
| Estimated useful lives of assets | 3 years | |
| Minimum [Member] | ||
| Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] | ||
| Estimated useful lives of assets | 3 years | |
| Maximum [Member] | ||
| Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] | ||
| Estimated useful lives of assets | 7 years | |
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- Definition Basis of presentation and summary of significant accounting policies. No definition available.
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- Definition Cash and cash equivalents maturity date description. No definition available.
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. No definition available.
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Description of the likelihood that an uncertainty in income taxes will not be sustained as a result of the examination by the taxing authority. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. No definition available.
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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