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Organization and Summary of Significant Accounting Policies Risks - concentration Revenue and Acct Rec, trading and H-T-M amounts (Details) (USD $)
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Sep. 30, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Dec. 31, 2011
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| 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 | ||
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Money Market Funds [Member]
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| 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 |
| X | ||||||||||
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- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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