v2.4.0.8

Organization and Summary of Significant Accounting Policies Risks - concentration Revenue and Acct Rec, trading and H-T-M amounts (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Trading Securities | $ 0 | $ 0 |  |
Cash and cash equivalents | 116,190,000 | 62,313,000 | 54,818,000 | 191,762,000
Held-to-maturity Securities, Fair Value | 0 | 0 |  |
Money Market Funds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | 64,775,000 | 38,892,000 |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | $ 38,891,000 |  |

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