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Credit Facility
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Credit facility
Credit Facility
The Company is party to a third amended and restated loan and security agreement (the “Credit Facility”) with a financial institution that provides for advances under a $35.0 million revolving line of credit. In February 2018, the Company entered into a first amendment to the Credit Facility that, among other things, extended the expiration of the Credit Facility from February 18, 2018 to February 18, 2021. In December 2018, the Company entered into a second amendment to the Credit Facility to make certain other revisions that do not alter the borrowing amounts, interest rates, or required ratios. The Credit Facility provides a $10.0 million subfacility for the issuance of letters of credit and contained an increase option permitting the Company, subject to the lender’s consent, to increase the revolving credit facility by up to $15.0 million, to an aggregate maximum of $50.0 million.
The Credit Facility bears interest, at the Company’s option, at either (i) the prime rate published by The Wall Street Journal, plus a spread of -0.25% to 0.50%, or (ii) a LIBOR rate determined in accordance with the terms of the Credit Facility, plus a spread of 1.75% to 2.50%. In each case, the spread is based on the Company’s adjusted quick ratio, which is a ratio of the Company’s cash and cash equivalents plus net billed accounts receivable to current liabilities plus all borrowings under the Credit Facility.
Interest is due and payable quarterly in arrears for prime rate loans and on the earlier of the last day of each quarter or the end of an interest period, as defined in the Credit Facility, for LIBOR rate loans. The Company is also obligated to pay an unused revolving line facility fee of 0.00% to 0.20% per annum based on the Company’s adjusted quick ratio.
The Credit Facility requires the Company to maintain an adjusted quick ratio of at least 1.50 to 1.00 on the last day of each quarter. If this adjusted quick ratio is not maintained, then the facility requires the Company to maintain, as measured at each quarter end, a maximum consolidated leverage ratio of 3.00 or 2.50 to 1.00, and a fixed charge coverage ratio of at least 1.25 to 1.00.
Consolidated leverage ratio is a ratio of all funded indebtedness, including all capital lease obligations, plus all letters of credit under the facility to the Company’s Adjusted EBITDA for the trailing twelve months. Fixed charge coverage ratio is the ratio of the Company’s Adjusted EBITDA minus cash income taxes to its cash interest payments for the trailing twelve months. The Credit Facility also limits the Company’s ability to pay dividends. At June 30, 2019, the Company was in compliance with the Credit Facility’s financial covenants. 
The Company’s future material domestic subsidiaries are required, upon the lender’s request, to become co-borrowers under the Credit Facility. Additionally, the Credit Facility contains acceleration clauses that accelerate any borrowings in the event of default. The Company’s obligations and those of its future material domestic subsidiaries are collateralized by substantially all of their respective assets, subject to certain exceptions and limitations. 
At June 30, 2019, the Company had no outstanding amounts under the Credit Facility and the amount available was $31.5 million, reduced for the letters of credit issued and outstanding under the subfacility of $3.5 million.