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Notes Payable	6 Months Ended
Notes Payable	Jun. 30, 2012
Line of Credit Facility [Abstract]
Notes Payable	Notes Payable We have a line of credit agreement with a brokerage firm. Under the terms of this agreement, we may borrow funds at a cost equal to the current Federal funds open rate plus 125 basis points (approximately1.3% as of June 30, 2012). Funds are advanced to us under this facility based on pre-determined advance rates on the cash and securities held by us in this brokerage account. Under this facility, we may borrow up to 75% of our total cash, cash equivalents and investments balance in this brokerage account with no restriction in the use of those assets. This agreement has no set expiration date and there are no loan covenants, other than the aforementioned collateral requirement. As of June 30, 2012 and as of December 31, 2011, $1.0 million and $1.0 million respectively, were outstanding under this facility, with a related collateral requirement of approximately $1.3 million and $1.3 million, respectively, of our cash, cash equivalents and investments.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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