Fair Value Measurements (Details) (USD $)
|
Dec. 31, 2012
|
Nov. 03, 2010
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Business Acquisition, Contingent Consideration, at Fair Value |
|
$ 1,600,000
|
Assets, Fair Value Disclosure, Nonrecurring |
2,523,000
|
|
Goodwill, Fair Value Disclosure |
2,523,000
|
|
Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Cash and Cash Equivalents, Fair Value Disclosure |
52,783,000
|
|
Investments, Fair Value Disclosure |
3,812,000
|
|
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 |
52,783,000
|
|
Investments, Fair Value Disclosure |
3,812,000
|
|
Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Cash and Cash Equivalents, Fair Value Disclosure |
52,783,000
|
|
Investments, Fair Value Disclosure |
3,812,000
|
|
Money Market Funds [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, 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] |
|
|
Investments, Fair Value Disclosure |
48,000
|
|
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
48,000
|
|
Mutual Funds [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
44,000
|
|
Mutual Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
44,000
|
|
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
44,000
|
|
US Treasury Securities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
2,450,000
|
|
US Treasury Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
2,450,000
|
|
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
2,450,000
|
|
Government agency securities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
1,270,000
|
|
Government agency securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
1,270,000
|
|
Government agency securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
Investments, Fair Value Disclosure |
1,270,000
|
|
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 |
10,956,000
|
|
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 |
10,956,000
|
|
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 |
10,956,000
|
|
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 |
41,827,000
|
|
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 |
41,827,000
|
|
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 |
$ 41,827,000
|
|