Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
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12 Months Ended |
|
Dec. 31, 2015 |
Dec. 31, 2013 |
Dec. 31, 2014 |
| Summary Of Significant Accounting Policies [Line Items] |
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|
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| Inventory Cost |
|
$ 51,000
|
|
| Certificate of deposit |
$ 228,000
|
|
$ 228,000
|
| Maturity period for marketable securities classified as available-for-sale |
1 year
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| Income tax examination, likelihood of settlement, description |
The amount of the benefit that may be recognized is the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement.
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|
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| Income tax examination, likelihood of settlement, percentage |
50.00%
|
|
|
| Unrealized loss on marketable securities |
$ (68,000)
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|
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| Minimum [Member] |
|
|
|
| Summary Of Significant Accounting Policies [Line Items] |
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|
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| Property and equipment, estimated useful life |
3 years
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| Maximum [Member] |
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|
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| Summary Of Significant Accounting Policies [Line Items] |
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|
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| Property and equipment, estimated useful life |
5 years
|
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| Certificates of Deposit [Member] |
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| Summary Of Significant Accounting Policies [Line Items] |
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| Certificate of deposit for collateralize credit card |
$ 0
|
|
60,000
|
| Certificate of deposit |
$ 228,000
|
|
$ 228,000
|