Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified
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Jun. 30, 2013
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Dec. 31, 2012
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Available-for-sale Securities |
$ 92
|
$ 92
|
Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Cash and Cash Equivalents, Fair Value Disclosure |
51,023
|
|
Marketable Securities, Fair Value Disclosure |
3,336
|
|
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 |
51,023
|
|
Marketable Securities, Fair Value Disclosure |
3,336
|
|
Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Cash and Cash Equivalents, Fair Value Disclosure |
51,023
|
|
Marketable Securities, Fair Value Disclosure |
3,336
|
|
Money Market Funds [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
48
|
|
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
|
|
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
48
|
|
Mutual Funds [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
44
|
|
Mutual 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 |
44
|
|
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
44
|
|
US Treasury Securities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
2,417
|
|
US Treasury Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
2,417
|
|
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
2,417
|
|
US Government Agencies Securities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
827
|
|
US Government Agencies Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
827
|
|
US Government Agencies Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Marketable Securities, Fair Value Disclosure |
827
|
|
Cash [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Cash and Cash Equivalents, Fair Value Disclosure |
9,194
|
|
Cash [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 |
9,194
|
|
Cash [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Cash and Cash Equivalents, Fair Value Disclosure |
9,194
|
|
Money Market Funds [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Cash and Cash Equivalents, Fair Value Disclosure |
41,829
|
|
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 |
41,829
|
|
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Cash and Cash Equivalents, Fair Value Disclosure |
$ 41,829
|
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