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Fair Value Measurements (Details) (Fair value measurements recurring basis, Money market funds, USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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Estimate of Fair Value
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Money market funds included in cash equivalents | $ 374 | $ 163 |
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Level 1 Inputs
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Money market funds included in cash equivalents | 374 | 163 |
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Level 2 Inputs
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Money market funds included in cash equivalents | ||
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Level 3 Inputs
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
| Money market funds included in cash equivalents |