Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Product Information [Line Items] | ||
| Cash and cash equivalents, maturity description | 90 days or less | |
| Short-term contractual maturities | 1 year | |
| Restricted cash | $ 170,000 | $ 170,000 |
| Impairment losses | 0 | |
| Interest or penalties related to income taxes | $ 0 | $ 0 |
| Minimum [Member] | ||
| Product Information [Line Items] | ||
| Property and equipment, estimated useful lives | 3 years | |
| Maximum [Member] | ||
| Product Information [Line Items] | ||
| Property and equipment, estimated useful lives | 7 years | |
| X | ||||||||||
- Definition Cash Equivalent Maturity Description No definition available.
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- Definition Short Term Investment Contractual Maturity No definition available.
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. 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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| X | ||||||||||
- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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