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Fair Value Measurements (Details) (USD $)
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Mar. 31, 2014
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Dec. 31, 2013
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Available-for-sale Securities |
$ 103,000
|
$ 103,000
|
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Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Cash and Cash Equivalents, Fair Value Disclosure |
37,878,000
|
|
| Marketable Securities, Fair Value Disclosure |
2,203,000
|
|
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Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
37,878,000
|
|
|
Fair Value, Inputs, Level 1 [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Cash and Cash Equivalents, Fair Value Disclosure |
37,878,000
|
|
| Marketable Securities, Fair Value Disclosure |
2,203,000
|
|
|
Money Market Funds [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Marketable Securities, Fair Value Disclosure |
48,000
|
|
|
Money Market Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
48,000
|
|
|
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
48,000
|
|
|
Mutual Funds [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Marketable Securities, Fair Value Disclosure |
55,000
|
|
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Mutual Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
55,000
|
|
|
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
55,000
|
|
|
US Treasury Securities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Marketable Securities, Fair Value Disclosure |
1,477,000
|
|
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US Treasury Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
1,477,000
|
|
|
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Marketable Securities, Fair Value Disclosure |
1,477,000
|
|
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US Government Agencies Securities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Marketable Securities, Fair Value Disclosure |
623,000
|
|
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US Government Agencies Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Marketable Securities, Fair Value Disclosure |
623,000
|
|
|
US Government Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Marketable Securities, Fair Value Disclosure |
623,000
|
|
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Cash [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Cash and Cash Equivalents, Fair Value Disclosure |
8,557,000
|
|
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Cash [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Cash and Cash Equivalents, Fair Value Disclosure |
8,557,000
|
|
|
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
8,557,000
|
|
|
Money Market Funds [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Cash and Cash Equivalents, Fair Value Disclosure |
29,321,000
|
|
|
Money Market Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
29,321,000
|
|
|
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and Cash Equivalents, Fair Value Disclosure |
$ 29,321,000
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