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Fair Value Measurements (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Nov. 03, 2010
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Fair Value, by Balance Sheet Grouping [Table Text Block] |
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As of December 31, 2013 |
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Fair Value Measurements |
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Carrying |
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Fair |
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As of December 31, 2013 |
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Amount |
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Value |
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Level 1 |
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Level 2 |
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Level 3 |
Assets: |
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Cash and cash equivalents: |
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Cash |
$ |
10,315 |
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$ |
10,315 |
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$ |
10,315 |
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$ |
— |
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$ |
— |
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Money market funds |
35,324 |
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35,324 |
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35,324 |
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— |
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— |
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$ |
45,639 |
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$ |
45,639 |
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$ |
45,639 |
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$ |
— |
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$ |
— |
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Marketable securities: |
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Money market funds |
$ |
48 |
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$ |
48 |
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$ |
48 |
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$ |
— |
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$ |
— |
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Mutual funds |
55 |
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55 |
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55 |
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— |
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— |
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U.S. Treasury securities |
1,730 |
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1,730 |
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1,730 |
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— |
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— |
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Government agency securities |
382 |
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382 |
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382 |
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— |
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— |
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$ |
2,215 |
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$ |
2,215 |
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$ |
2,215 |
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$ |
— |
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$ |
— |
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| Business Acquisition, Contingent Consideration, at Fair Value |
$ 500,000
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$ 1,600,000
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| Assets, Fair Value Disclosure, Nonrecurring |
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2,523,000
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| Goodwill, Fair Value Disclosure |
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2,523,000
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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 |
45,639,000
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52,783,000
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| Investments, Fair Value Disclosure |
2,215,000
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3,812,000
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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] |
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| Cash and Cash Equivalents, Fair Value Disclosure |
45,639,000
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52,783,000
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| Investments, Fair Value Disclosure |
2,215,000
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3,812,000
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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 |
45,639,000
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52,783,000
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| Investments, Fair Value Disclosure |
2,215,000
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3,812,000
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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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| Investments, Fair Value Disclosure |
48,000
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48,000
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Money Market Funds [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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| Investments, Fair Value Disclosure |
48,000
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48,000
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Money Market Funds [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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| Investments, Fair Value Disclosure |
48,000
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48,000
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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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| Investments, Fair Value Disclosure |
55,000
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44,000
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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] |
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| Investments, Fair Value Disclosure |
55,000
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44,000
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Mutual Funds [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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| Investments, Fair Value Disclosure |
55,000
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44,000
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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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| Investments, Fair Value Disclosure |
1,730,000
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2,450,000
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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] |
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| Investments, Fair Value Disclosure |
1,730,000
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2,450,000
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US Treasury 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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| Investments, Fair Value Disclosure |
1,730,000
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2,450,000
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Government agency 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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| Investments, Fair Value Disclosure |
382,000
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1,270,000
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Government agency 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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| Investments, Fair Value Disclosure |
382,000
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1,270,000
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Government agency 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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| Investments, Fair Value Disclosure |
382,000
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1,270,000
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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 |
10,315,000
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10,956,000
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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 |
10,315,000
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10,956,000
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Cash [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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| Cash and Cash Equivalents, Fair Value Disclosure |
10,315,000
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10,956,000
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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 |
35,324,000
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41,827,000
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Money Market Funds [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 |
35,324,000
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41,827,000
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Money Market Funds [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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| Cash and Cash Equivalents, Fair Value Disclosure |
$ 35,324,000
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$ 41,827,000
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