11. Revolving Credit Facility

        The Company maintains two Credit and Security Agreements, as amended (the "Agreements"), with Wells Fargo Bank, National Association ("Wells Fargo"), which provide the Company with a line of credit of up to $15.0 million in the aggregate. The line of credit can be increased to an amount up to $20.0 million upon the request of the Company pursuant to the amendment described below (the "Credit Facility"). In addition, Wells Fargo has provided the Company with a non-revolving capital expenditure line of credit up to $0.5 million to acquire additional eligible equipment for use in the Company's business pursuant to the amendment described below. As of March 31, 2015, the Company had not requested that the maximum line amount be increased to an aggregate of $20.0 million pursuant to the Agreements. The amount actually available to the Company may be less and may vary from time to time depending on, among other factors, the amount of its eligible inventory and accounts receivable. As security for the payment and performance of the Credit Facility, the Company granted a security interest in favor of Wells Fargo in substantially all of the assets of the Company. One of the Agreements will terminate in accordance with its terms on September 1, 2017 and the other one will terminate on September 30, 2017.

        The Agreements include affirmative covenants as well as negative covenants that prohibit a variety of actions without Wells Fargo's consent, including covenants that limit the Company's ability to (a) incur or guarantee debt, (b) create liens, (c) enter into any merger, recapitalization or similar transaction or purchase all or substantially all of the assets or stock of another entity, (d) pay dividends on, or purchase, acquire, redeem or retire shares of, the Company's capital stock, (e) sell, assign, transfer or otherwise dispose of all or substantially all of the Company's assets, (f) change the Company's accounting method or (g) enter into a different line of business. Furthermore, the Agreements contain financial covenants, including (i) a requirement not to exceed specified levels of losses, (ii) a requirement to maintain a substantial minimum cash balance relative to the outstanding line of credit advances, which was $11.8 million as of March 31, 2015, and (iii) limitations on the Company's annual capital expenditures. The Agreements also define an event of default to include a material adverse effect on the Company's business, as determined by Wells Fargo. An event of default for this or any other reason, if not waived, would have a material adverse effect on the Company.

        Several times since entering into the Agreements the Company was not in compliance with certain covenants under the Credit Facility. In connection with each event of noncompliance, Wells Fargo waived the event of default and, on several occasions, the Company amended the Agreements in response to the default and waiver. The following summarizes the recent events, amendments and waivers:

        If the Company had not obtained the waivers and amended the Agreements as described above, the Company would not have been able to draw additional funds under the Credit Facility. In addition, the Company has pledged its accounts receivables, inventories, equipment, patents and other assets as collateral for its Agreements, which would be subject to seizure by Wells Fargo if the Company were in default under the Agreements and unable to repay the indebtedness. Wells Fargo also has the option to terminate the Agreements or accelerate the indebtedness during a period of noncompliance. Based on the Company's current forecasts, the Company believes it will maintain compliance with the covenants contained in the amended Agreements for at least the next twelve months. If a covenant violation were to occur, the Company would attempt to negotiate a waiver of compliance from Wells Fargo.

        The Company is required to maintain a Wells Fargo collection account for cash receipts on all of its accounts receivable. These amounts are immediately applied to reduce the outstanding amount on the Credit Facility. The floating rate for line of credit advances is the sum of daily three month London Inter—Bank Offer Rate ("LIBOR"), which interest rate shall change whenever daily three month LIBOR changes, plus applicable margin. Based on the revolving nature of the Company's borrowings and payments, the Company classifies all outstanding amounts as current liabilities. The applicable margin varies based on net income and the minimum interest floor is set at $66,000 each calendar quarter. The Company's borrowing rate was 4.0% at each of March 31, 2015 and March 31, 2014.

        The Company is also required to pay an annual unused line fee of one-quarter of one percent of the daily average of the maximum line amount and 1.5% interest with respect to each letter of credit issued by Wells Fargo. These amounts, if any, are also recorded as interest expense by the Company. As of March 31, 2015 and March 31, 2014, $13.0 million and $13.2 million in borrowings were outstanding, respectively, under the Credit Facility. As of March 31, 2015, approximately $1.4 million was available for additional borrowing. Interest expense related to the Credit Facility during the year ended March 31, 2015 was $0.5 million, which includes $0.2 million in amortization of deferred financing costs. Interest expense related to the Credit Facility during the year ended March 31, 2014 was $0.7 million, which includes $0.2 million in amortization of deferred financing costs. Interest expense related to the Credit Facility during the year ended March 31, 2013 was $0.7 million, which includes $0.1 million in amortization of deferred financing costs.