Credit Facility	6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]
Credit facility	Credit Facility The Company had previously entered into a third amended and restated loan and security agreement (the “Third Amended Credit Facility”) with a financial institution that provided for advances under a revolving line of credit and had no outstanding amounts at December 31, 2017. In February 2018, the Company entered into a first amendment to the Third Amended Credit Facility (“First Amendment”). The Third Amended Credit Facility, as amended by the First Amendment (the “Credit Facility”), has a $35.0 million secured revolving credit facility that expires on February 18, 2021. The Credit Facility provides a $10.0 million subfacility for the issuance of letters of credit and contains 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. The consolidated leverage ratio is a ratio of all funded indebtedness, including all capital lease obligations, plus all letters of credit under the Credit 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 and capital expenditures to its cash interest payments measured on a trailing twelve month-basis. The Credit Facility also limits the Company’s ability to pay dividends. At June 30, 2018, the Company was in compliance with all financial covenants. The Company’s future material domestic subsidiaries are required, upon the lender’s request, to become co-borrowers under the Credit Facility. The Credit Facility contains acceleration clauses that accelerate any borrowings in the event of default. The obligations of the Company and its future material domestic subsidiaries are collateralized by substantially all of their respective assets, subject to certain exceptions and limitations. At June 30, 2018, the Company had no outstanding amounts under the Credit Facility and the amount available was $31.0 million, reduced for the letters of credit issued and outstanding under the subfacility of $4.0 million.

Credit Facility

The Company had previously entered into a third amended and restated loan and security agreement (the “Third Amended Credit Facility”) with a financial institution that provided for advances under a revolving line of credit and had no outstanding amounts at December 31, 2017. In February 2018, the Company entered into a first amendment to the Third Amended Credit Facility (“First Amendment”).

The Third Amended Credit Facility, as amended by the First Amendment (the “Credit Facility”), has a $35.0 million secured revolving credit facility that expires on February 18, 2021. The Credit Facility provides a $10.0 million subfacility for the issuance of letters of credit and contains 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.

The consolidated leverage ratio is a ratio of all funded indebtedness, including all capital lease obligations, plus all letters of credit under the Credit 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 and capital expenditures to its cash interest payments measured on a trailing twelve month-basis. The Credit Facility also limits the Company’s ability to pay dividends. At June 30, 2018, the Company was in compliance with all financial covenants.

The Company’s future material domestic subsidiaries are required, upon the lender’s request, to become co-borrowers under the Credit Facility. The Credit Facility contains acceleration clauses that accelerate any borrowings in the event of default. The obligations of the Company and its future material domestic subsidiaries are collateralized by substantially all of their respective assets, subject to certain exceptions and limitations.

At June 30, 2018, the Company had no outstanding amounts under the Credit Facility and the amount available was $31.0 million, reduced for the letters of credit issued and outstanding under the subfacility of $4.0 million.