Credit Facilities	6 Months Ended
Credit Facilities	Jun. 30, 2013
Line of Credit Facility [Abstract]
Credit Facilities	Credit Facilities We maintain a credit facility with Silicon Valley Bank for cash advances of up to an aggregate of $30 million based upon an advance rate dependent on certain concentration limits within eligible accounts receivable. These limits exclude certain eligible customer receivables if an individual customer account balance exceeds 25, 50 or 70 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% as of June 30, 2013 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, increasing by 50% of net income, 50% of issuances of equity and 50% of the principal amount of any subordinated debt. 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. The maturity date of the credit facility is July 21, 2015. As of June 30, 2013, there was $2.1 million outstanding under the Silicon Valley Bank line of credit. There was $21.0 million available for borrowing under the agreement as of June 30, 2013. 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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