Credit Facilities	12 Months Ended
Credit Facilities	Dec. 31, 2012
Line of Credit Facility [Abstract]
Credit Facilities	Credit Facilities We maintain a credit facility with Silicon Valley Bank for cash advances and letters of credit of up to an aggregate of $30 million based upon an advance rate dependent on certain concentration limits within eligible accounts receivable. These limitations exclude certain eligible customer receivables if an individual customer account balance exceeds 25, 50 or 85 percent of the total eligible accounts receivable, depending on the customer, as defined by our Loan and Security Agreement with Silicon Valley Bank. Borrowings under the credit facility bear interest at the prime rate, which was 4% at December 31, 2012, and are secured by substantially all of our accounts receivable, deposit and securities accounts. The agreement provides for a negative pledge on our inventory and intellectual property, subject to certain exceptions, and contains usual and customary covenants for an arrangement of its type, including an obligation that we maintain at all times a net worth, as defined in the agreement, of $50 million (subject to certain increases). The agreement also includes provisions to increase the financing facility by $20 million subject to our meeting certain requirements, including $40 million in borrowing base for the immediately preceding 90 days, and Silicon Valley Bank locating a lender willing to finance the additional facility. In addition, if our cash and cash equivalents net of the total amount outstanding under the credit facility fall below $20 million (measured on a rolling three-month basis), the interest rate will increase to prime plus 1% and additional restrictions will apply. Our credit facility also provides for a cash management services sublimit under the revolving credit line of up to $0.3 million. During the second quarter of 2012, we amended our credit agreement with Silicon Valley Bank. The amendment extends the maturity date to July 21, 2015 and amended certain other terms of the credit agreement, which we do not believe significantly impacts our financial position. As of December 31, 2012 we had no outstanding letters of credit and there was $2.8 million outstanding under the Silicon Valley Bank line of credit. There was $16.8 million available for borrowing under the agreement as of December 31, 2012. We are currently in compliance with all covenant requirements.

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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