Credit Facility	3 Months Ended
Mar. 31, 2018
Credit Facility	Note 5 — Credit Facility In March 2014, the Company and its domestic subsidiaries entered into a secured credit facility with General Electric Capital Corporation (“GECC”). The loan agreement, as amended and subsequently assigned to Wells Fargo Bank, N.A. pursuant to its acquisition of GECC, provides for a $75.0 million revolving credit facility subject to availability based on prescribed advance rates on certain domestic accounts receivable and inventory (the “WF Loan Agreement”). The amounts outstanding under the credit facility, as amended, are payable in full upon maturity of the facility on March 27, 2019, except that the credit facility will mature on June 15, 2018 if we do not refinance or extend the maturity of the Convertible Senior Notes that mature in 2018, provided that any such refinancing or extension shall have a maturity date that is no sooner than six months after the stated maturity of the facility (i.e., on or about September 27, 2019). The credit facility is secured by a security interest in favor of the lender covering a substantial amount of the assets of the Company. As of March 31, 2018, there were no outstanding borrowings and the amount of outstanding stand-by letters of credit totaled $13.7 million; the total excess availability under the facility was $10.0 million. As of December 31, 2017, the amount of outstanding borrowings was $5.0 million and outstanding stand-by letters of credit totaled $20.0 million; the total excess availability under the facility was $14.1 million. The Company’s ability to borrow under the WF Loan Agreement is also subject to its ongoing compliance with certain financial covenants, including the maintenance by the Company of a fixed charge coverage ratio of at least 1.25:1.0 based on the trailing four fiscal quarters in the event minimum excess availability of $10.0 million under the facility is not maintained. As of March 31, 2018 and December 31, 2017, the Company was in compliance with the financial covenants under the WF Loan Agreement. The Company may borrow funds at LIBOR or at a Base Rate, plus applicable margins of 225 basis point spread over LIBOR and 125 basis point spread on Base Rate loans. The Base Rate is the highest of (i) the Federal Funds Rate plus a margin of 0.50%, (ii) the rate last quoted by The Wall Street Journal as the “Prime Rate,” or (iii) the sum of a LIBOR rate plus 1.00%. In addition to standard fees, the facility has an unused credit line fee, which ranges from 25 to 50 basis points. As of March 31, 2018 and December 31, 2017, the weighted average interest rate on the credit facility was approximately 3.79%. The WF Loan Agreement also contains customary events of default, including a cross default provision and a change of control provision. In the event of a default, all of the obligations of the Company and its subsidiaries under the WF Loan Agreement may be declared immediately due and payable. For certain events of default relating to insolvency and receivership, all outstanding obligations become due and payable.

Note 5 — Credit Facility

In March 2014, the Company and its domestic subsidiaries entered into a secured credit facility with General Electric Capital Corporation (“GECC”). The loan agreement, as amended and subsequently assigned to Wells Fargo Bank, N.A. pursuant to its acquisition of GECC, provides for a $75.0 million revolving credit facility subject to availability based on prescribed advance rates on certain domestic accounts receivable and inventory (the “WF Loan Agreement”). The amounts outstanding under the credit facility, as amended, are payable in full upon maturity of the facility on March 27, 2019, except that the credit facility will mature on June 15, 2018 if we do not refinance or extend the maturity of the Convertible Senior Notes that mature in 2018, provided that any such refinancing or extension shall have a maturity date that is no sooner than six months after the stated maturity of the facility (i.e., on or about September 27, 2019). The credit facility is secured by a security interest in favor of the lender covering a substantial amount of the assets of the Company. As of March 31, 2018, there were no outstanding borrowings and the amount of outstanding stand-by letters of credit totaled $13.7 million; the total excess availability under the facility was $10.0 million. As of December 31, 2017, the amount of outstanding borrowings was $5.0 million and outstanding stand-by letters of credit totaled $20.0 million; the total excess availability under the facility was $14.1 million.

The Company’s ability to borrow under the WF Loan Agreement is also subject to its ongoing compliance with certain financial covenants, including the maintenance by the Company of a fixed charge coverage ratio of at least 1.25:1.0 based on the trailing four fiscal quarters in the event minimum excess availability of $10.0 million under the facility is not maintained. As of March 31, 2018 and December 31, 2017, the Company was in compliance with the financial covenants under the WF Loan Agreement.

The Company may borrow funds at LIBOR or at a Base Rate, plus applicable margins of 225 basis point spread over LIBOR and 125 basis point spread on Base Rate loans. The Base Rate is the highest of (i) the Federal Funds Rate plus a margin of 0.50%, (ii) the rate last quoted by The Wall Street Journal as the “Prime Rate,” or (iii) the sum of a LIBOR rate plus 1.00%. In addition to standard fees, the facility has an unused credit line fee, which ranges from 25 to 50 basis points. As of March 31, 2018 and December 31, 2017, the weighted average interest rate on the credit facility was approximately 3.79%.

The WF Loan Agreement also contains customary events of default, including a cross default provision and a change of control provision. In the event of a default, all of the obligations of the Company and its subsidiaries under the WF Loan Agreement may be declared immediately due and payable. For certain events of default relating to insolvency and receivership, all outstanding obligations become due and payable.