Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |
9 Months Ended | ||
|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Dec. 31, 2014 |
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| Accounting Policies [Abstract] | |||
| Cash and cash equivalents, maturity description | 90 days or less | ||
| Short-term contractual maturities | 1 year | ||
| Restricted cash | $ 170,000 | $ 100,000 | |
| Interest or penalties related to income taxes | $ 0 | $ 0 | |
| X | ||||||||||
- Definition Cash Equivalent Maturity Description No definition available.
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| X | ||||||||||
- Definition Short Term Investment Contractual Maturity No definition available.
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| X | ||||||||||
- References 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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| X | ||||||||||
- 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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